You are using OSSN v5.6 which is not supported and outdated. Causing issues with php version. (7.4.x)

Thanks Allon.
You should contact Openteknik since this issue seems to be Ossn Premium related.

Ok well, here's what the error log shows...
[13-Aug-2022 17:14:38 UTC] [#1660410878|A6F60FBCED081B03F46518B19F011C56] ParseError: syntax error, unexpected end of file in /home/ncirclec/public_html/N37WORK/classes/OssnSystem.php(42) : eval()'d code:1
Stack trace:

0 /home/ncirclec/public_html/N37WORK/classes/OssnKernel.php(38): OssnSystem->execPCI('declined')

1 /home/ncirclec/public_html/N37WORK/classes/OssnKernel.php(357): OssnKernel->trigger('processor', Array)

2 /home/ncirclec/publichtml/N37WORK/components/Kernel/ossncom.php(114): OssnKernel::setINIT()

3 /home/ncirclec/publichtml/N37WORK/libraries/ossn.lib.system.php(258): ossnkernel_trigger('components', 'after:load', Array)

4 /home/ncirclec/publichtml/N37WORK/classes/OssnComponents.php(232): ossntrigger_callback('components', 'after:load', Array)

5 /home/ncirclec/public_html/N37WORK/libraries/ossn.lib.components.php(69): OssnComponents->loadComs()

6 /home/ncirclec/publichtml/N37WORK/system/start.php(38): includeonce('/home/ncirclec/...')

7 /home/ncirclec/publichtml/N37WORK/system/handlers/actions.php(12): requireonce('/home/ncirclec/...')

8 {main}

Well, the explanation should be - as always - located in your error_log file.