Hi please see this error

Strict Standards: Declaration of BtK2DataSource::parseImages() should be compatible with that of BTSource::parseImages() in public_html/modules/mod_bt_contentslider/classes/k2.php on line 25

Strict Standards: Only variables should be assigned by reference in public_html/modules/mod_bt_contentslider/classes/k2.php on line 129

Strict Standards: Only variables should be assigned by reference in /public_html/modules/mod_bt_contentslider/classes/k2.php on line 133

Strict Standards: Only variables should be assigned by reference in /public_html/modules/mod_bt_contentslider/classes/k2.php on line 134

Strict Standards: Only variables should be assigned by reference in /public_html/modules/mod_bt_contentslider/classes/k2.php on line 170

Strict Standards: Non-static method modBtContentSliderHelper::fetchHead() should not be called statically in /public_html/modules/mod_bt_contentslider/mod_bt_contentslider.php on line 89

Strict Standards: Only variables should be assigned by reference in /public_html/modules/mod_bt_contentslider/helpers/helper.php on line 69

I think this error for WHM
please help me how to fix this problem

None of those are errors just notices, but anyway all of them make reference to a module external to K2. Get in contact with the developers of that module