This IIS Web Site running Microsoft SharePoint Foundation contains two Web Parts 'TypeName = |0, Assembly = |1' and 'TypeName ...

This IIS Web Site running Microsoft SharePoint Foundation contains two Web Parts 'TypeName = |0, Assembly = |1' and 'TypeName = |2, Assembly = |3' that are using the same WebPartTypeID value, which is not allowed. To continue, the system administrator must disable one of these Web Parts in the  section of the ASP.NET configuration file (web.config) for this IIS Web Site. To use both Web Parts together, the assembly name or type must be changed by the Web Part developer.