Weird

Warning: LANG chunk is not empty, its content will not be exported!
Warning: EXTN chunk is not empty, its content will not be exported!
Warning: unknown chunk GLOB, chunk is not empty, its content will not be exported!
Warning: SHDR chunk is not empty, its content will not be exported!
Warning: TMLN chunk is not empty, its content will not be exported!
Warning: DAFL chunk is not empty, its content will not be exported!
An error occured:
System.ArgumentException: An item with the same key has already been added.
   at System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   at Altar.Decomp.Disassembler.GetReferenceTable(GMFileContent content, ReferenceDef[] defs)
   at Altar.GMFile..ctor(GMFileContent f)
   at Altar.GMFile.GetFile(Byte[] data)
   at Altar.Program.Export(ExportOptions eo)
   at Altar.Program.<>c.<Main>b__9_0(String verb, Object vo)