Plugin Error Message

It appear error message after I turn on the debug mode.

Notice: Use of undefined constant ABS_PATH_TO_MO_FILE - assumed 'ABS_PATH_TO_MO_FILE' in D:\xampp\htdocs\wp\wp-content\plugins\pie-register\pie-register.php on line 121

Notice: Undefined index: txn_id in D:\xampp\htdocs\wp\wp-content\plugins\pie-register\pie-register.php on line 4814

Notice: Undefined index: action in D:\xampp\htdocs\wp\wp-content\plugins\pie-register\pie-register.php on line 4819

Notice: Undefined index: action in D:\xampp\htdocs\wp\wp-content\plugins\pie-register\pie-register.php on line 4821

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in D:\xampp\htdocs\wp\wp-includes\functions.php on line 3193

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https://wordpress.org/plugins/pie-register/