I am already few time to restart Debkinsta but its still same issue. Can anyone here to help me to solve this problem.
Thank you
Hey @Shakib_D_Shy 
I think the solution’ll be like this: Can't create a site DK0021 - #3 by Krishna
If you’re using windows please try to delete all elements from the following folder and recreate the site:
C:\Users\username\AppData\Roaming\DevKinsta\installers
this is a hidden folder