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If you receive an error, while using a Bentley Hydraulics and Hydrology product, that references engineering libraries then the following steps will allow you to revert back to the original.
**Before performing the steps below please make sure to close the application**
1. Navigate to this location:
Windows XP: C:\Documents and Settings\<user name>\Application Data\Bentley\EngineeringLibraries\Windows 7 and later: C:\Users\<user name>\AppData\Roaming\Bentley\EngineeringLibraries\
2. Delete the EngineeringLibraries.mdb (EngineeringLibraries.sqlite for newer versions) and any .bak or backup files for this database file.
If you don't see the files or folders listed above, make sure they aren't hidden.
Here are the steps to do this in Windows 7:
3. Open the program
If the error is still generated, contact Bentley Technical Support and they can provide a clean copy of the engineering libraries file.
Error when opening: "System.TypeInitializationException"