Unknown error when opening page in design mode
Versions:
4.70,
FAQ number:
28,
Old FAQ number: 965
Q: Why do I get 'Unknown error' when opening an EPiServer aspx page in design mode?
A: This is most likely a license checksum error. To fix this you need to copy the Web.config and epilic.dll files to the Microsoft Visual Studio .NET\Common7\IDE folder. After you have copied the files, close all instances of VS.NET to flush all dll-files that VS.NET holds in memory. After that restart VS.NET.