Error message

• Deprecated function: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated in MTSLProducer->getProducerVideoUrl() (line 1567 of sites/all/modules/mtsl/include/products.inc.php).
• Deprecated function: stripos(): Passing null to parameter #1 ($haystack) of type string is deprecated in MTSLProducer->getProducerVideoUrl() (line 1567 of sites/all/modules/mtsl/include/products.inc.php).
• Deprecated function: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in advagg_file_url_alter() (line 809 of sites/all/modules/advagg/advagg.module).