Please check the image attached. The server is simply failing to save the right path on windows. (Note: the crucible service in windows is running as "Administrator" account.
It is always important to check the supported platform: https://confluence.atlassian.com/fisheye/supported-platforms-298976955.html and install proper Mercurial client.
I solved it by installing 4.5.3 version of Mercurial and setting Environmental path to the Mercurial bin folder in Windows.
Below Atlassian KB article help you to configure mercurial with crucible.
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