MySQL tables name with underscore problem

When I create a MySQL service and I try to get a table named with underscores, dreamfactory show:

There was an error connecting to
Why this might have happened:
The server couldn’t send a response:
Ensure that the backend is working properly
Self-signed SSL certificates are being blocked:
Fix this by turning off ‘SSL certificate verification’ in Settings > General
Client certificates are required for this server:
Fix this by adding client certificates in Settings > Certificates
Request timeout:
Change request timeout in Settings > General

that’s the output from postman, and my server version is Ubuntu 16.04, I have two days with this error and need to put my app in production soon. please help me