Using a webfrom civi contribution page and when submitting I get an error that a recurring interval must be selected, even though i have it set to user selects.
I've seen this only once before, when someone messed with the Recurring Frequency Units options.
- Go to CiviCRM's Administer menu » System Settings » Option Groups.
- Find Recurring Frequency Units and select Edit Options.
Compare the values you see to the attached screenshot. If they aren't an exact match, that's your problem. Set the values exactly as seen in this screenshot and the error will go away.