Unable to add any row in strategy and segment assignment task

Summary:

Hi Team

We are trying to add row in strategy and segment assignment task
I am trying to add segment and strategy but getting below errror

The matrix is not valid. You must fix the matrix rules before you can continue. (QP-2715597)

Its working till last week all of suddenly we are getting this
Can you help me in fixing this?
This is in production
Thanks

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