If your users can login to the application successfully, but receive the message "No folders found. If you think this an error, click here for to access our solutions page", the CRM URL in your company setup may be incorrect.

Check the following in the company setup to ensure the url does not contain the following syntax "domainname.lightning.force.com". 

The correct setup is "domainname.my.salesforce.com", as illustrated below.

Correct Setup: https://launchq.my.salesforce.com

Incorrect Setup: https://launchq.lightning.force.com