Unable to connect to backend. HTTP error 500

other info

PHP version 5.6.30
Maximum file upload size 64M
Post maximum file upload size 65M
Memory Limit 512M
Timeout 300
Browser and OS Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36
DISALLOW_FILE_EDIT FALSE

@toarun4u1,

Please visit the settings page of the file manager and press save.

Thanks
Aftabul Islam

https://vedtechno.com/wordpress-file-manager-error-unable-connect-backend-http-error-500/
the issue was with ninja forms..

if anyone using ninja , gravity forms or any other forms then its conflicting with FM

• This reply was modified 7 years, 1 month ago by toarun4u1.

Same problem here “Unable to connect to backend. HTTP error 500”
Can’t hit save on settings because there is no save in the free version and disabling Formidable didn’t help either.