Build problem on Linux: Error Initializing the configuration system. ---> System.Xml.XmlException: Invalid data ---> System.Text.DecoderFallbackException: Exception of type 'System.Text.DecoderFallbackException' was thrown. How to fix?

Development Platform & Builds
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I was hoping to build UE4 on my LInux system (following the directions at A new, community-hosted Unreal Engine Wiki - Announcements - Unreal Engine Forums). Setup.sh finished with a ‘Success’ message. When I run ./GenerateProjectFiles.sh I get an error, pasted below. Any clues as to what might be the problem?

brandon@brandon-Lenovo-IdeaPad-Y500:~/projects/UnrealEngine$ ./GenerateProjectFiles.sh 

Setting up Unreal Engine 4 project files...

    + xbuild Source/Programs/UnrealBuildTool/UnrealBuildTool.csproj /verbosity:quiet /nologo /p:TargetFrameworkVersion=v4.5 /p:Configuration=Development
    + mono Binaries/DotNET/UnrealBuildTool.exe -makefile -kdevelopfile -qmakefile -cmakefile -codelitefile
    
    Unhandled Exception:
    System.Configuration.ConfigurationErrorsException: Error Initializing the configuration system. ---> System.Xml.XmlException: Invalid data ---> System.Text.DecoderFallbackException: Exception of type 'System.Text.DecoderFallbackException' was thrown.
      at System.Text.DecoderExceptionFallbackBuffer.Fallback (System.Byte[] bytesUnknown, Int32 index) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding.Fallback (System.Object provider, System.Text.DecoderFallbackBuffer& buffer, System.Byte[]& bufferArg, System.Byte* bytes, Int64 byteIndex, UInt32 size, System.Char* chars, System.Int32& charIndex) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding.InternalGetChars (System.Byte* bytes, Int32 byteCount, System.Char* chars, Int32 charCount, System.UInt32& leftOverBits, System.UInt32& leftOverCount, System.Object provider, System.Text.DecoderFallbackBuffer& fallbackBuffer, System.Byte[]& bufferArg, Boolean flush) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding.InternalGetChars (System.Byte[] bytes, Int32 byteIndex, Int32 byteCount, System.Char[] chars, Int32 charIndex, System.UInt32& leftOverBits, System.UInt32& leftOverCount, System.Object provider, System.Text.DecoderFallbackBuffer& fallbackBuffer, System.Byte[]& bufferArg, Boolean flush) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding+UTF8Decoder.GetChars (System.Byte[] bytes, Int32 byteIndex, Int32 byteCount, System.Char[] chars, Int32 charIndex) [0x00000] in <filename unknown>:0 
      at System.Xml.NonBlockingStreamReader.ReadBuffer () [0x00000] in <filename unknown>:0 
      at System.Xml.NonBlockingStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 
      at System.Xml.XmlStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 
      --- End of inner exception stack trace ---
      at System.Xml.XmlStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.ReadTextReader (Int32 remained) [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.PeekChar () [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.ReadContent () [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.Read () [0x00000] in <filename unknown>:0 
      at System.Xml.XmlTextReader.Read () [0x00000] in <filename unknown>:0 
      at System.Xml.XmlReader.MoveToContent () [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration.ReadConfigFile (System.Xml.XmlReader reader, System.String fileName) [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration.Load () [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration.Init (IConfigSystem system, System.String configPath, System.Configuration.Configuration parent) [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration..ctor (System.Configuration.InternalConfigurationSystem system, System.String locationSubPath) [0x00000] in <filename unknown>:0 
      at System.Configuration.InternalConfigurationFactory.Create (System.Type typeConfigHost, System.Object[] hostInitConfigurationParams) [0x00000] in <filename unknown>:0 
      at System.Configuration.ConfigurationManager.OpenExeConfigurationInternal (ConfigurationUserLevel userLevel, System.Reflection.Assembly calling_assembly, System.String exePath) [0x00000] in <filename unknown>:0 
      at System.Configuration.ClientConfigurationSystem.get_Configuration () [0x00000] in <filename unknown>:0 
      --- End of inner exception stack trace ---
      at System.Configuration.ClientConfigurationSystem.get_Configuration () [0x00000] in <filename unknown>:0 
      at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
      at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
      at System.Configuration.ConfigurationSettings.GetConfig (System.String sectionName) [0x00000] in <filename unknown>:0 
      at System.Diagnostics.DiagnosticsConfiguration.get_Settings () [0x00000] in <filename unknown>:0 
      at System.Diagnostics.TraceImpl.InitOnce () [0x00000] in <filename unknown>:0 
      at System.Diagnostics.TraceImpl.get_Listeners () [0x00000] in <filename unknown>:0 
      at System.Diagnostics.Trace.get_Listeners () [0x00000] in <filename unknown>:0 
      at UnrealBuildTool.Log.WriteLinePrivate (Int32 StackFramesToSkip, System.String CustomSource, Boolean bWriteOnce, LogEventType Verbosity, System.String Format, System.Object[] Args) [0x00000] in <filename unknown>:0 
      at UnrealBuildTool.Log.TraceError (System.String Format, System.Object[] Args) [0x00000] in <filename unknown>:0 
      at UnrealBuildTool.UnrealBuildTool.Main (System.String[] Arguments) [0x00000] in <filename unknown>:0 
    [ERROR] FATAL UNHANDLED EXCEPTION: System.Configuration.ConfigurationErrorsException: Error Initializing the configuration system. ---> System.Xml.XmlException: Invalid data ---> System.Text.DecoderFallbackException: Exception of type 'System.Text.DecoderFallbackException' was thrown.
      at System.Text.DecoderExceptionFallbackBuffer.Fallback (System.Byte[] bytesUnknown, Int32 index) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding.Fallback (System.Object provider, System.Text.DecoderFallbackBuffer& buffer, System.Byte[]& bufferArg, System.Byte* bytes, Int64 byteIndex, UInt32 size, System.Char* chars, System.Int32& charIndex) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding.InternalGetChars (System.Byte* bytes, Int32 byteCount, System.Char* chars, Int32 charCount, System.UInt32& leftOverBits, System.UInt32& leftOverCount, System.Object provider, System.Text.DecoderFallbackBuffer& fallbackBuffer, System.Byte[]& bufferArg, Boolean flush) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding.InternalGetChars (System.Byte[] bytes, Int32 byteIndex, Int32 byteCount, System.Char[] chars, Int32 charIndex, System.UInt32& leftOverBits, System.UInt32& leftOverCount, System.Object provider, System.Text.DecoderFallbackBuffer& fallbackBuffer, System.Byte[]& bufferArg, Boolean flush) [0x00000] in <filename unknown>:0 
      at System.Text.UTF8Encoding+UTF8Decoder.GetChars (System.Byte[] bytes, Int32 byteIndex, Int32 byteCount, System.Char[] chars, Int32 charIndex) [0x00000] in <filename unknown>:0 
      at System.Xml.NonBlockingStreamReader.ReadBuffer () [0x00000] in <filename unknown>:0 
      at System.Xml.NonBlockingStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 
      at System.Xml.XmlStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 
      --- End of inner exception stack trace ---
      at System.Xml.XmlStreamReader.Read (System.Char[] dest_buffer, Int32 index, Int32 count) [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.ReadTextReader (Int32 remained) [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.PeekChar () [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.ReadContent () [0x00000] in <filename unknown>:0 
      at Mono.Xml2.XmlTextReader.Read () [0x00000] in <filename unknown>:0 
      at System.Xml.XmlTextReader.Read () [0x00000] in <filename unknown>:0 
      at System.Xml.XmlReader.MoveToContent () [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration.ReadConfigFile (System.Xml.XmlReader reader, System.String fileName) [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration.Load () [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration.Init (IConfigSystem system, System.String configPath, System.Configuration.Configuration parent) [0x00000] in <filename unknown>:0 
      at System.Configuration.Configuration..ctor (System.Configuration.InternalConfigurationSystem system, System.String locationSubPath) [0x00000] in <filename unknown>:0 
      at System.Configuration.InternalConfigurationFactory.Create (System.Type typeConfigHost, System.Object[] hostInitConfigurationParams) [0x00000] in <filename unknown>:0 
      at System.Configuration.ConfigurationManager.OpenExeConfigurationInternal (ConfigurationUserLevel userLevel, System.Reflection.Assembly calling_assembly, System.String exePath) [0x00000] in <filename unknown>:0 
      at System.Configuration.ClientConfigurationSystem.get_Configuration () [0x00000] in <filename unknown>:0 
      --- End of inner exception stack trace ---
      at System.Configuration.ClientConfigurationSystem.get_Configuration () [0x00000] in <filename unknown>:0 
      at System.Configuration.ClientConfigurationSystem.System.Configuration.Internal.IInternalConfigSystem.GetSection (System.String configKey) [0x00000] in <filename unknown>:0 
      at System.Configuration.ConfigurationManager.GetSection (System.String sectionName) [0x00000] in <filename unknown>:0 
      at System.Configuration.ConfigurationSettings.GetConfig (System.String sectionName) [0x00000] in <filename unknown>:0 
      at System.Diagnostics.DiagnosticsConfiguration.get_Settings () [0x00000] in <filename unknown>:0 
      at System.Diagnostics.TraceImpl.InitOnce () [0x00000] in <filename unknown>:0 
      at System.Diagnostics.TraceImpl.get_Listeners () [0x00000] in <filename unknown>:0 
      at System.Diagnostics.Trace.get_Listeners () [0x00000] in <filename unknown>:0 
      at UnrealBuildTool.Log.WriteLinePrivate (Int32 StackFramesToSkip, System.String CustomSource, Boolean bWriteOnce, LogEventType Verbosity, System.String Format, System.Object[] Args) [0x00000] in <filename unknown>:0 
      at UnrealBuildTool.Log.TraceError (System.String Format, System.Object[] Args) [0x00000] in <filename unknown>:0 
      at UnrealBuildTool.UnrealBuildTool.Main (System.String[] Arguments) [0x00000] in <filename unknown>:0