Hi @PuspaRaj_Subedi, welcome to DevKinsta!
Thank you for sending me your main.log file. If you are still unable to cancel the process, here are instructions on how to “reset” the process: Stuck on Canceling maintenance, restore snapshot - #7 by Kevin
There are a few different errors in your main.log that could be causing the DK0026. I recommend contacting our Live Support and asking them to “reset staging” to delete everything that is currently there. After that please try to push again and share the main.log if it fails.
I recommend this because I am seeing this error in your logs: Rsync error code 12 - How we figure it out?
Please let me know if the issue continues.