https://wordpress.org/support/topic/some-php-strict-errors-with-itempropwp?replies=1

call_user_func_array() expects parameter 1 to be a valid callback, non-static method itempropwp::init() should not be called statically

call_user_func_array() expects parameter 1 to be a valid callback, non-static method itempropwp_review::reviewinit() should not be called statically

call_user_func_array() expects parameter 1 to be a valid callback, non-static method sidebar_generator::init() should not be called statically