Error - EXCEPTION

Error: EXCEPTION
Message: realpath(): Passing null to parameter #1 ($path) of type string is deprecated
File: /home2/guiaclinicascom/public_html/library/vendor/twig/twig/src/Loader/FilesystemLoader.php
Line: 40

#0 [internal function]: TinyMVC_ErrorHandler(8192, 'realpath(): Pas...', '/home2/guiaclin...', 40)
#1 /home2/guiaclinicascom/public_html/library/vendor/twig/twig/src/Loader/FilesystemLoader.php(40): realpath(NULL)
#2 /home2/guiaclinicascom/public_html/library/tinymvc/myfiles/plugins/tinymvc_library_twig.php(26): Twig\Loader\FilesystemLoader->__construct(Array)
#3 /home2/guiaclinicascom/public_html/library/tinymvc/sysfiles/plugins/tinymvc_load.php(113): TinyMVC_Library_twig->__construct()
#4 /home2/guiaclinicascom/public_html/library/tinymvc/myfiles/controllers/BasicController.php(123): TinyMVC_Load->library('twig', 'aux')
#5 /home2/guiaclinicascom/public_html/library/tinymvc/myfiles/controllers/BasicController.php(39): BasicController->loadLibrary('twig')
#6 /home2/guiaclinicascom/public_html/library/tinymvc/sysfiles/TinyMVCSite.php(232): BasicController->__construct(true)
#7 /home2/guiaclinicascom/public_html/library/tinymvc/sysfiles/TinyMVCSite.php(130): tmvc->setupController()
#8 /home2/guiaclinicascom/public_html/index.php(26): tmvc->main()
#9 {main}