Hi! It's really difficult that someone can provide help with this little information. I'm not really qualified to help you, but I can recommend you to at least describe what OS, tomcat, java an database version you are using. You should also look at https://wiki.lyrasis.org/display/DSPACE/Troubleshoot+an+error#Troubleshootanerror-DSpace7.x(orabove) and try to find the underlying problem so it's easier for someone to figure out whats going on.
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