May occur during data exchange. Other error message could be "Internal error. The string routine in file ...dstream.cpp (or dumplog.cpp), line 123 failed with HRESULT 0x8007007a". Database requires a "repair". Solution:
DBCC CHECKDB ('Name of my database', Repair_ALL).
If you have a problem with your shop, it can often be solved by cleaning the cache. Therefore try to clear the cache first.