Server Error dre,
very obvious sa exception code ng java, may memory load issue ang server, di niya na kayang i handle ang request on executing the specific java script indicated on the logs.
first to check
Resources ng server tingnan mo kung kaya pa niya or malaki pa ang memory na narereserve in a normal operation
2nd to check
baka yung java script mo may memory leak, common most problem to in a website.