Warnings during load

Have few WARNINGs and ERRORs during loading UE on Linux.

  1. Warning: Failed to load font data from ‘…/…/…/Engine/Content/Slate/Fonts/Roboto-Italic.ttf’
  2. LogDirectoryWatcher:Warning: Failed to begin reading directory changes for …/…/…/Engine/Plugins/Experimental/CharacterAI/Content/.
  3. Warning: Failed to load font data from ‘…/…/…/Engine/Content/Editor/Slate/Fonts/Roboto-Regular.ttf’
    Warning: Failed to load font data from ‘…/…/…/Engine/Content/Editor/Slate/Fonts/Roboto-Bold.ttf’
  4. [2015.06.17-20.40.07:711][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:711][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.
    [2015.06.17-20.40.07:740][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:740][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.
    [2015.06.17-20.40.07:768][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:768][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.
    [2015.06.17-20.40.07:819][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:819][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.
    [2015.06.17-20.40.07:874][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:874][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.
    [2015.06.17-20.40.07:921][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:921][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.
    [2015.06.17-20.40.07:948][ 0]LogJson:Warning: Field EngineVersion was not found.
    [2015.06.17-20.40.07:948][ 0]LogJson:Error: Json Value of type ‘Null’ used as a ‘String’.

Did you figured it out?