The problem with the plugin ContactForm7?

When you submit a form by email. an email comes in, a message about successful sending no. Only the eternally spinning loader near the button.
REST API > rest_api_loaded not disabled.
Version 5.1.3 of the plugin. Retreated to 4.7 - did not help.
How to fix this?
March 23rd 20 at 19:45
2 answers
March 23rd 20 at 19:47
1) If the rest api was disabled, the letters would not bahadili
2) look for the js error (look in console)
3) look for conflicts with plugins or theme (alternately disconnect and see when will work)
March 23rd 20 at 19:49
Solved the problem!
There was a conflict with the plugin Bicycles by falbar.
It was disabled json rest api.

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