When you search for tasks in the AdminUI (Adminui > Services > LiveCycle Process Management ES > Task Search), the following HTTP error occurs:
Error 500--Internal Server Error From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1: 10.5.1 500 Internal Server Error The server encountered an unexpected condition which prevented it from fulfilling the request.
This error occurs when there is information missing from the database entry for a certain task in the returned list of results. For example, if the PROCESS_NAME value is empty or null for a task in the TB_TASK table. This issue can happen if you use custom code to access the database directly and modify it. It can also occur if you are running a purge utility not supplied by Adobe on the database.
Adobe plans to fix this issue in ES2 SP2 and in ES3.
This error is a product issue in LiveCycle ES and there are patches available for 18.104.22.168 and 22.214.171.124. You should contact enterprise support if you require one of these patches. The issue has been fixed in ES2 SP2 and later versions.