[Zope] Problems with Zcatalog

Hi, I have a problem with the ZCatalog. When I try to Update the Catalog or index all the objects , Zope give to me this: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, root@domain.com and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. I have 8000 words indexed. What's going on? Thanks