Debug mode is enabled by default and it will show the server side failure reason. When going in production mode, you should disable the debug mode by following config.
$g = new jqgrid(); $g->debug = 0;
If you wish to change the SQL errors, you can turn them off using following setting.
$g->error_msg = "System was unable to process your request. Please contact technical support.";
For custom message at server side data validation, refer demos/editing/server-validation.php
In order to debug SQL queries, set:
$g->debug_sql = 1;
In order to debug Search queries, set:
$g->debug_search = 1;
debug_search configuration, you will see SQL queries being sent to database in error message box.
You can also close error box and continue next debug step.