You've a fulltext index in _comprofiler table. As far as I'm aware nothing of ours will add such an index so it was likely added by a plugin or manually. You'll need to fix the index within your _comprofiler table before switching it to InnoDB as InnoDB doesn't support fulltext indexes. See the below search regarding further information on the error.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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krileon
