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Issue -Error message (from tfs.visualstudio.com):

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Cause:

Your solution has been previously binded, but when you rebind, its to your old configuration. You will need to check out again.

Solution 1:

Make sure you back up all your changes.

1. Remove binding to your solution.
2. Bind again
3. Deal with merges

Solution 2 (Could be safer as you coping over data, and still have unchanged original changes):

1. Check our to different location
2. Copy over your changes
3. Deal with merges