Fatal error in GoogleCalendar.class.php

When I try the "test.php" file, I get the following errors:

Fatal error: Using $this when not in object context in /..../..../public_html/ev/_classes/GoogleCalendar.class.php on line 75

Warning: file_put_contents(/home3/callisor/public_html/ev/tmp/class_path_cache.txt) [function.file-put-contents]: failed to open stream: No such file or directory in /..../..../public_html/ev/_classes/Autoloader.class.php on line 149

Fatal error: Autoloader could not write the cache file: /..../..../public_html/ev/tmp/class_path_cache.txt in /..../..../public_html/ev/_classes/Autoloader.class.php on line 151


I assume the second and third might be caused by not having a "tmp" folder in my root folder. However, the first error is caused by the script. How should I fix this?

I'm uploading the fix to this.