rets Code: 20210 Msg: RETS Server: This is a duplicate of a query already running

I am receiving this error when I try to import listings

drealty encountered an error: (Type: rets Code: 20210 Msg: RETS Server: This is a duplicate of a query already running.)

Not sure what to do.

Update: issue solved.

The problem went away when I disabled the backup migrate module.