Fatal error: Uncaught TypeError: Argument 1 passed to fnGetSignature() must be of the type int, null given, called in /volume2/web/iteach4u/htdocs/2017/studymaterials/view.php on line 162 and defined in /volume2/web/iteach4u/htdocs/2017/_lib/function_DB.php:593
Stack trace:
#0 /volume2/web/iteach4u/htdocs/2017/studymaterials/view.php(162): fnGetSignature(NULL)
#1 /volume2/web/iteach4u/htdocs/2017/studymaterials/index.php(119): include('/volume2/web/it...')
#2 {main}
thrown in /volume2/web/iteach4u/htdocs/2017/_lib/function_DB.php on line 593
