It's worth a shot, but that's a case I reported. The errors were different:
Error 1 Illegal data type: itextsharp.text.pdf.xfaform`1+stack2[system.string].
0 0 itextwrap (C:\Users\Bruce.new\Downloads\iTextWrapper)
Error 2 Illegal data type: itextsharp.text.pdf.xfaform`1+stack2[system.string].
0 0 itextwrap (C:\Users\Bruce.new\Downloads\iTextWrapper)
Error 3 Illegal .NET data type (Are you missing an assembly reference?): itextsharp.text.pdf.xfaform`1+stack2[system.string]
0 0 itextwrap (C:\Users\Bruce.new\Downloads\iTextWrapper)
Error 4 Illegal data type: itextsharp.text.pdf.xfaform<system.string>.stack2.
0 0 itextwrap (C:\Users\Bruce.new\Downloads\iTextWrapper)