Events Module Manage Acceptance Not Working

HI

I have installed SuiteCRM 7.7.8 on windows server and then I have created event and I added some delegates to that.
If I try to select some delegates and to mark them as Accepted , Nothing happens

No errors in console. I check all file permission everything is OK but in suite CRM log I am getting following error.

[3528][1][FATAL] Query Failed:UPDATE fp_events_contacts_c SET accept_status=“Accepted” WHERE fp_events_contactsfp_events_ida=“c6f7a473-d30c-cb1c-cc5d-582f3625fdac” AND fp_events_contactscontacts_idb=“e5c55b67-0b9b-52f9-c5bf-582f175ac6fa”::: [Microsoft][ODBC Driver 13 for SQL Server][SQL Server]Invalid column name ‘c6f7a473-d30c-cb1c-cc5d-582f3625fdac’.
[Microsoft][ODBC Driver 13 for SQL Server][SQL Server]Invalid column name ‘e5c55b67-0b9b-52f9-c5bf-582f175ac6fa’.

Why it’s showing like this even though there is no column name given as mentioned above in the error.