SP2.1

I installed the new SP2.1 on my system but after that my templates don't working I have this error message

HTTP Status 500 - Dispatch[/UserTemplate] to method saveTemplate returned an exception

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type Status report

message Dispatch[/UserTemplate] to method saveTemplate returned an exception

description The server encountered an internal error (Dispatch[/UserTemplate] to method saveTemplate returned an exception) that prevented it from fulfilling this request.

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Apache Tomcat/5.0.28

Help me please