here is Warning and Error measage from Client:
2018-10-06T02:07:00.897-08:00 avvcbimage Info <0000>: vm-246
2018-10-06T02:07:00.905-08:00 avvcbimage Info <0000>: Snapshot 'VDP-1538762794f7fdb7b5ce52c77da9d043bc5a11f7360868c5fb' creation for VM '[san-strong] ubuntu14.04-weixin-2.14/ubuntu14.04-weixin-2.14.vmx' task still in progress, sleep for 3 sec
2018-10-06T02:07:04.134-08:00 avvcbimage Warning <19733>: vSphere Task failed (quiesce, snapshot error=45): 'An error occurred while saving the snapshot: Failed to quiesce the virtual machine.'.
2018-10-06T02:07:04.135-08:00 avvcbimage Error <17775>: Snapshot 'VDP-1538762794f7fdb7b5ce52c77da9d043bc5a11f7360868c5fb' creation for VM '[san-strong] ubuntu14.04-weixin-2.14/ubuntu14.04-weixin-2.14.vmx' task creation encountered a quiesce problem
2018-10-06T02:07:04.136-08:00 avvcbimage Warning <0000>: The VM could not be quiesced prior to snapshot creation and this backup will not be used as a base for subsequent CBT backups if successful.
2018-10-06T02:07:04.136-08:00 avvcbimage Warning <40711>: Consider using the pre-freeze and post-thaw scripts to facilitate VM quiescing
2018-10-06T02:07:04.136-08:00 avvcbimage Warning <41146>: This error might caused by the pre-freeze script returning a non-zero error code.
detail in attachment.
thanks for you help !!!.
