HTTP ERROR 500

[lghinelli-git]

Using SimpleSAMLphp test page under the "Test authentication sources" tab it works fine viceversa in Moodle I got an error 500

[bradjones1]

There's not enough actionable information here; needs more info.

[lghinelli-git]

Hello Brad,
I suppose that the configuration of simplesamlphp is correct, because if I check the Idp with the application test page I can log in and see the user attributes.
I also configured another SAML plugin, based on simplesamlphp, on the Moodle instance and it forwards me to the idp correctly.
Is there any misconfiguration on your plug-in that can cause the 500 error?
Obviously Moodle works fine.

[lghinelli-git]

Checked on Moodle 3.9.1+ (Build: 20200903) and Moodle 3.6.4+ (Build: 20190620)

Debugging output enabled
Validating auth_saml ... OK
[OK] Name of the plugin to be installed [saml]
[OK] Plugin version [2019071601]
[OK] Required Moodle version [2017111300]
[OK] Full component name [auth_saml]
[OK] Declared maturity level [MATURITY_STABLE]
[OK] Plugin release [auth/saml version of 16-07-2019]
[Debug] Found language file [auth_saml]
[OK] Write access check [/var/www/html/moodle2/auth]

Validation successful, installation can continue

[pitbulk]

What appears in the error logs for this 500 error?