VM - Ubuntu 20.04 can't connect "sf_transfer_folder"

[kalpana]

Host - Ubuntu 20.04
VM - Ubuntu 20.04

It is very strange. Just found all Ubuntu 20.04 VMs unable to connect "sf_transfer_folder"

Warning:
Code:

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VBoxClienT: Failure waiting for event,rc=VERR_INVALID_HA...
On Ubuntu 20.04 VM Terminal

$ lsb_release -r
Release: 20.04

$ VBoxClient --version
6.1.32r149290

$ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0

All Windows10 VMs don't have this problem.

Please advise how to solve the problem. Thanks

Regards