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ram rjram rj 

i am getting this error

"There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Process failed. First exception on row 0; first error: MANAGER_NOT_DEFINED, Manager undefined.: [] "
This looks like a validation rule that was created for another module conflicting with the creation of objects for this module.  You can either remove / deactivate the old validation rule or you can create a new developer org [1] and do the work in that org.  Personally, I create a new developer org after I complete a couple of modules to keep them from colliding.  As long as you follow the instructions in the link below, you can have as many developer orgs as you want to do your trailhead development in and still have all the badges associated with a single user.

[1] https://developer.salesforce.com/forums/?id=906F00000005JciIAE
Amit Chaudhary 8Amit Chaudhary 8
Please check below post. I hope that will help you
Deepthi BDeepthi B
Hello Ram,

May be you have missed out entering one of the fields that is required for the process. Kindly check once again all the fields before saving.