Initialize PDFsharp submodule in MigraDoc
masterMigraDoc uses PDFsharp as a submodule. If you have cloned the MigraDoc repository via Git, you must manually initialize and update the submodule to ensure the PDFsharp source files are present in your local environment.
If you are downloading MigraDoc as a ZIP file from certain sources, the PDFsharp submodule may be empty; in that case, you must also download the PDFsharp ZIP separately, unless using the SourceForge ZIP which includes both.
git submodule init
git submodule update