CodeIgniter HMVC error after updating PHP to PHP 7

CodeIgniter HMVC error after updating PHP to PHP 7::

After updating the php version 5.6 to 7.2 it is showing fatal errors and warnings etc. Like
A PHP Error was encountered
Severity: Warning
Message: Declaration of MX_Lang::load($langfile, $lang = ”, $return = false, $add_suffix = true, $alt_path = ”, $_module = ”) should be compatible with CI_Lang::load($langfile = ”, $idiom = ”, $return = false, $add_suffix = true, $alt_path = ”)
Filename: MX/Lang.php
Line Number: 70
## QUESTION::
After updating 5.6 to PHP 7. I was using HMVC implementation of Code Igniter and PHP upgrade started throwing following errors:-
A PHP Error was encountered Severity: Warning
Message: Declaration of MX_Loader::library($library, $params = NULL, $object_name = NULL) should be compatible with CI_Loader::library($library = ”, $params = NULL, $object_name = NULL)
Filename: MX/Loader.php
Line Number: 143
A PHP Error was encountered Severity: Warning
Message: Declaration of MX_Loader::helper($helper) should be compatible with CI_Loader::helper($helpers = Array)
Filename: MX/Loader.php
Line Number: 0
A PHP Error was encountered Severity: Warning
Message: Declaration of MX_Loader::helpers($helpers) should be compatible with CI_Loader::helpers($helpers = Array)
Filename: MX/Loader.php
Line Number: 0
A PHP Error was encountered Severity: Warning
Message: Declaration of MX_Loader::language($langfile, $lang = ”, $return = false) should be compatible with CI_Loader::language($file = Array, $lang = ”)
Filename: MX/Loader.php
Line Number: 0
A PHP Error was encountered Severity: Warning
Message: Declaration of MX_Loader::_ci_get_component($component) should be compatible with & CI_Loader::_ci_get_component($component)
Filename: MX/Loader.php
Line Number: 0
A PHP Error was encountered Severity: Warning
Message: Declaration of MX_Lang::load($langfile, $lang = ”, $return = false, $_module = NULL) should be compatible with CI_Lang::load($langfile = ”, $idiom = ”, $return = false, $add_suffix = true, $alt_path = ”)
Filename: MX/Lang.php
Line Number: 70
A PHP Error was encountered Severity: Notice
Message: Only variables should be assigned by reference
Filename: core/Loader.php
Line Number: 257
## ANSWERS::
1.third_party\MX\Lang.php
    line = 134
    public function library($library = ”, $params = NULL, $object_name = NULL)
    2.third party\MX\Loder.php
     line=105
     pulic function helper($helper = array())
    3.third party\MX\Loder.php
     line=120
     pulic function helper($helper = array())
    4.third party\MX\Loder.php
     line=124
    public function language($langfile=array(), $idiom = ”, $return = FALSE, $add_suffix = TRUE, $alt_path = ”)
    5.third party\MX\Loder.php
     line=271
    public function  &_ci_get_component($component)
    6.third party\MX\Lang.php
     line=70
    public function load($langfile =”, $lang = ”, $return = FALSE, $add_suffix = TRUE, $alt_path = ”, $_module = ”)
    7.system/core/commopn.php
     line=257
         $_config[0] =& $config;
           return $_config[0];
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