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Error "Not a valid bookmark." appears when some records in JET Database are corrupted. You can find out that it is common problem for all JET databases
It happened because Plesk uses JET DB provider as records storage. To resolve this problem it is necessary to repair the database. I think you should contact Plesk Support Team. Also you can try switching the Plesk database provider to Mysql via Plesk Reconfigurator - would it help?