This thread is resolved. Here is a description of the problem and solution.
Problem:
Adding a CRED Form to your WebSite which includes some Types Custom Fields (like radio fields) produces a Fatal Error on the screen:
PHP Warning: require_once(field/class.radio.php): failed to open stream: No such file or directory in .../cred-frontend-editor/application/controllers/form_rendering.php on line 83
PHP Fatal error: require_once(): Failed opening required 'field/class.radio.php' (include_path='.:/Applications/MAMP/bin/php/php7.0.22/lib/php') in .../cred-frontend-editor/application/controllers/form_rendering.php on line 83
Solution:
This is solved in the stable Toolset release.
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The Edit and also the creation Cred Form was only empty when you try to open it - after the updates from WP to 4.8.3 and / or the last Types, Views and Cred Updates.
These happens if you user try to open the form from frontend. But also if you edit the credforms and use previewfunction inside cred it shows only empty content.
I deactivate the Javascript in the form (for limit input in a textfield) - that works well the last year, but it doesn't help.
I try to back to last versions of cred(1.9.2) , types(2.2.16) and Views (2.4.1) but it doesn't help.
I attach a screenshot from form in backend and in frontend.
