Google maps displaying error code

Martin took a look at a map error issue that came up. Unfortunately, the problem (although not showing on the front end) is still displaying in the dashboard.

As a reminder the error code is:

open(/tmp/sess_nf13sjevbpev2hspadnmf0p8u1, O_RDWR) failed: Permission denied (13) in /home/jacalsou/public_html/wp-content/plugins/wpmu_dev_maps_plugin/inc/external/wpmu-lib/inc/class-thelib-base.php on line 68

Warning: session_start(): Cannot send session cache limiter - headers already sent (output started at /home/jacalsou/public_html/wp-content/plugins/wpmu_dev_maps_plugin/inc/external/wpmu-lib/inc/class-thelib-base.php:68) in /home/jacalsou/public_html/wp-content/plugins/wpmu_dev_maps_plugin/inc/external/wpmu-lib/inc/class-thelib-base.php on line 68

Thanks in advance.