Settings page run into HTTP ERROR 500

Replies: 0

Hey,

After installing the plugin, I cannot access the Settings / WP Mail SMTP. If I click on it, the following error occures ona broken page: HTTP ERROR 500

The runs WP version: 3.7.27 and php version 5.5. Normally it should be compatible.

I cannot update the Wp version for higher.

What could be the problem? How could I solve it?

Thx in advance