TimThumb error…

Hi, I have installed Mobile Press and so far I am pleased, but thumbs are not working A question-mark instead of the image is shown. The theme is installed in the wp-content/themes directory.
This is the error appearing when I open the image to show in a separate browser tab:

Warning: touch() [function.touch]: Utime failed: Permission denied in /home/zardmediagroup/wp-content/plugins/mobilepress/libraries/timthumb.php on line 203

Warning: touch() [function.touch]: Unable to create file ./timthumb/cache/timthumb_cacheLastCleanTime.touch because Permission denied in /home/zardmediagroup/wp-content/plugins/mobilepress/libraries/timthumb.php on line 465

Warning: file_exists() [function.file-exists]: open_basedir restriction in effect. File(/home/zardmediagroup/wp-content/plugins/mobilepress/libraries/timthumb.php/files/2012/05/Veronica-Peparini1-e1336564422322.jpg) is not within the allowed path(s): (/home/zardmediagroup/:/tmp/) in /home/zardmediagroup/wp-content/plugins/mobilepress/libraries/timthumb.php on line 900
A TimThumb error has occured

The following error(s) occured:
Could not create the index.html file - to fix this create an empty file named index.html file in the cache directory.
Could not create cache clean timestamp file.
Could not find the internal image you specified.

Query String : src=http://www.romeoegiuliettaopera.it/files/2012/05/Veronica-Peparini1-e1336564422322.jpg&w=50&h=50
TimThumb version : 2.8.9

Thank you!

http://wordpress.org/extend/plugins/mobilepress/