Today I’ll talk about a problem that may occur when you develop content types.
It may happens that when you deploy your development, you come across an error like « the parent content type specified by content type identifier 0x0101 does not exist ».
This error can occur if you commented some of your code in the xml file containing the definition of your content type.
I still do not understand the relationship between the error and the error message but hey … The beauty of SharePoint development!
Hope this helps!