Strange MODX behaviour!

[halftrainedharry]

Maybe this post helps to locate the error log.

Modx api how to use runSnippet?

That completely depends on your server configuration and is independent of MODX entirely. Common locations are within a server control panel, /usr/local/apache/logs/error_log, var/log/httpd/error_log, /var/log/apache2/error.log, as error_log files in the directory the error was triggered in, or elsewhere. On MODX Cloud it’s in your home directory > log. If you check the phpinfo() output (which MODX has a utility for, in manage > reports > system info > phpinfo()) find the error_log directive. …