Cannot save cube after correcting the configuration mistake

STEPS:
1. Modify cube, add 2 count(which will cause save error).
2. Save cube and got save error caused by 2 count
3. Go to pre and correct the count mistake
4. Save

RESULT:
4. Error Message
Failed to deal with the request: Overwriting conflict /model_desc/test_test.json, expect old TS 1449478829188, but it is 1449478590889