[Solved] Either ‘GDI’, ‘WPF’ or ‘SILVERLIGHT’ must be defined how to remove this error?

Question

Open the project properties for the project that throws the error (Alt+Enter in VS Solution Explorer), go to the Build tab and enter the symbol you want into the “Conditional compilation symbols” field. Enter one of the three values.

It seems the value got lost. I cannot tell you which value got lost. Check one of the other PDFsharp projects (I hope not all projects lost their symbols).

Accepted Answer

Open the project properties for the project that throws the error (Alt+Enter in VS Solution Explorer), go to the Build tab and enter the symbol you want into the “Conditional compilation symbols” field. Enter one of the three values.

It seems the value got lost. I cannot tell you which value got lost. Check one of the other PDFsharp projects (I hope not all projects lost their symbols).