ORA-00054 means that another session has a database object lock that completely prevents our action.
Your script that you present is confused, but basically someone has a lock on the table - maybe they execute XML against DML, and you wonβt be able to drop it until they release this lock (i.e. commit or rollback )
Having said everything, I'm not sure why you want to drop the table in order to fix the PL / SQL compilation problem. You should review your question to give us a clearer picture of what you are trying to achieve.
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