Provider 'MailEnable' is not available. Cannot backup messages

[serhanv]

Few days ago i can backup all things via plesk backup panel but now i cant backup mail contents. and in privatetemp bacup logs there is an error like this: Provider 'MailEnable' is not available. Cannot backup messages. Why this error may have occurred?

 

[serhanv]

i solve the problem

upgrading my mail enable pro v4.17 to v4.22 is the answer. now everything goes true.