Severity: Notice
Message: Only variable references should be returned by reference
Filename: core/Common.php
Line Number: 257
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 104
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 104
Severity: Notice
Message: Trying to get property of non-object
Filename: models/slides_model.php
Line Number: 40
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 131
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 135
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 137
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 137
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 138
Severity: Notice
Message: Trying to get property of non-object
Filename: controllers/lecture.php
Line Number: 138