When trying to create and save a new Attribute set. I am presented with a message saying "ATTENTION Sorry, we're unable to complete this request." when trying to save.
Preconditions: Magento CE 2.1.3 OR fresh installation of 2.1.5 - (i tried on both versions)
Steps to reproduce: Go to Stores -> Attributes -> Attribute Sets Click "Add Attribute Set" Enter Attribute Set name and select base set ("Default" selected) and click "Save" Assign attributes (NOTE: this error happens even if no new attributes are assigned) Click "Save".
I am presented with a notice "ATTENTION Sorry, we're unable to complete this request" (No errors are shown). I am then allowed to a) Close the modal using the "X", or b) Click "OK", which closes the modal.