UMG - How can i get text in editable text box?

I have an issue with .OnTextCommited . It brings to LINK error. If I use .OnTextChanged (with proper delegate signature, of course) it works.

The LINK error is:

Error : LNK2019: unresolved external symbol “__declspec(dllimport) class UEnum * __cdecl Z_Construct_UEnum_SlateCore_ETextCommit(void)” (_imp?Z_Construct_UEnum_SlateCore_ETextCommit@@YAPEAVUEnum@@XZ) referenced in function “void __cdecl `dynamic initializer for ‘public: static struct UECodeGen_Private::FBytePropertyParams const Z_Construct_UFunction_UFactoryParamsWidget_OnTQtyCommited_Statics::NewProp_CommitMethod’'(void)” (??__E?NewProp_CommitMethod@Z_Construct_UFunction_UFactoryParamsWidget_OnTQtyCommited_Statics@@2UFBytePropertyParams@UECodeGen_Private@@B@@YAXXZ)

Is it that I might miss something in build.cs ?