Troubleshooting the MOSS error: "An unexpected error has occurred"

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Change the following values in your web.config file so that you can see what the actual error is:

1. Change CallStack="false" to CallStack="true"

2. Change <customErrors mode="On"/>  to <customErrors mode="Off "/>  

3. Change <compilation batch="false" debug="false"> to <compilation batch="false" debug="true">  

When you are done, make sure to change these three back to its original value as there is a performance hit when these are turned on/enabled.