PHP error display

Dear,

System suddenly stopped working & return following PHP errors.
Please help me with this.

‘’’

A PHP Error was encountered

Severity: 8192

Message: strpos(): Non-string needles will be interpreted as strings in the future. Use an explicit chr() call to preserve the current behavior

Filename: MX/Router.php

Line Number: 224

Backtrace:

File: /home/nexify/public_html/in/application/third_party/MX/Router.php
Line: 224
Function: strpos

File: /home/nexify/public_html/in/application/third_party/MX/Router.php
Line: 214
Function: _set_default_controller

File: /home/nexify/public_html/in/index.php
Line: 325
Function: require_once
‘’’

A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /home/nexify/public_html/in/vendor/codeigniter/framework/system/core/Exceptions.php:271)

Filename: core/Security.php

Line Number: 281

Backtrace:

File: /home/nexify/public_html/in/index.php
Line: 325
Function: require_once

Please search in the Forum, this Error is related to PHP 7.2 and PHP 7.3.
It cant “suddenly” stop working if it did befor. Think about what have been changed (maybe PHP Version?).

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