Backup Manager page in Plesk displays an alike error message, or the same message is getting delivered to Plesk administrator email address during scheduled backups:
ERROR: PleskPMMResponseException Failed to parse response. Reason: Failed to read data from stream Process output
Plesk error log contains:
[panel]: Failed to parse response. Reason: Failed to read data from stream Process output: : 0: PMMConnector.php:641 PMMConnector->getResponse(object of type StreamXMLReader) 1: PMMConnector.php:70 PMMConnector->getDumpList(object of type PMMDumpsStorageCredentials, object of type PMMObjectSpecification) 2: BackupLocalRepositoryList.php:18 BackupLocalRepositoryList->fetchBackupLocalRepositoryList() 3: cList.php:87 cList->fetchList() 4: cList.php:109 cList->init() 5: backup.abstract-repository.php:68 __backup__abstract_repository->accessItemsList(string 'GET', NULL null) 6: backup.abstract-repository.php:27 __backup__abstract_repository->accessItem(string 'GET', NULL null) 7: UIPointer.php:619 UIPointer->access(string 'GET') 8: plesk.php:36
This issue is likely caused by the custom dynamic libraries installed on the server.
Please refer to the following KB articles that might help to resolve the issue:
In case if this does not help, please contact Parallels support with reference to this KB.