Inbound group email : SCHEDULERS: could not get an IMAP connection resource for ID

Hi,

Previously the email to case activity is working fine. and we mark that email as inactive and created a new inbound email handler while setting up the handler it shows the test setting result as completed connection successfully. Ref image1

then we are getting a error log as stated below: Ref iamge2

[FATAL] SCHEDULERS: could not get an IMAP connection resource for ID [ 729affe6-4fd3-fd42-cdfb-57025a612d8e ]. Skipping mailbox [ CRM Renewals Handler ]

then we again check with the inbound handler setting which shows an error Ref image3.

can anyone tell me how to resolve it.