@Komal-Sharma Thank you for help! I have created a ticket. I look forward to the response!

I just realized I should have posted some technical info about my instance.

• I'm using the open source version running on a VM using Ubuntu 20.04(LTS).
  uvdesk version 1.1.1 downloaded from website and installed manually using
  https://www.uvdesk.com/en/blog/installation-open-source-helpdesk-uvdesk/.

• apache version 2.4

• mySQL version 8.0.31

• PHP version 7.4.3

• Composer version 2.4.4

This is a fresh VM, with nothing else installed on it.

Hello:

I just installed uvdesk, and it was working well while I configured the agent accounts. However, as soon as I tried to configure a swiftmailer (following the instructions on the uvdesk support page), nothing at all works. No matter what I try to do, I get a swiftmailer error, even for pages that have nothing to do with it. The root index page, the agents page, everything gives this error (see screenshot below). Any advice?