created ClocktreeSpec(UpdatedClock2.ctstch) tool itself is adding extra
string to the file name ".functional" and unable to synthesize the
clock tree, stating the following error
**ERROR: (ENCSYUTIL-96): Cannot open (for read) Clock Synthesis Technology File file: "UpdatedClock2.ctstch.functional".
Reason for error: No such file or directory.
**ERROR: (ENCCK-430): CTS was unable to open the file UpdatedClock2.ctstch.functional.
How to overcome this?