Using Drupal 7.53 and civicrm 4.7.15.

Attempting to merge two contacts and get this message:

"Sorry but we are not able to provide this at the moment. Expected one RuleGroup but found 0" Return to home page.



This happened to us, and it turned out that we didn't have a "supervised" dedupe rule defined for individuals. You can have at most one "supervised" and one "unsupervised" dedupe rule. Our supervised rule had disappeared (though I haven't worked out how). I recreated it and the error disappeared. There's some relevant documentation here: https://docs.civicrm.org/user/en/latest/common-workflows/deduping-and-merging/#dedupe-rules

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