1) Welcome to the Party!
2) As you are obviously new here, I have some suggestions to help us all help you:
When you post, please post your entire configuration including (but not limited to) your installation method (7.X.X?) and vicidial version with build (VERSION: 2.X-XXXx ... BUILD: #####-####).
This IS a requirement for posting along with reading the stickies (at the top of each forum) and the manager's manual (available on EFLO.net, both free and paid versions)
You should also post: Asterisk version, telephony hardware (model number is helpful here), cluster information if you have one, and whether any other software is installed in the box. If your installation method is "manual/from scratch" you must post your operating system with version (and the .iso version from which you installed your original operating system) plus a link to the installation instructions you used. If your installation is "Hosted" list the site name of the host.
If this is a "Cloud" or "Virtual" server, please note the technology involved along with the version of that techology (ie: VMware Server Version 2.0.2). If it is not, merely stating the Motherboard model # and CPU would be helpful.
Similar to This:
Vicibox X.X from .iso | Vicidial X.X.X-XXX Build XXXXXX-XXXX | Asterisk X.X.X | Single Server | No Digium/Sangoma Hardware | No Extra Software After Installation | Intel DG35EC | Core2Quad Q6600
3) This Appears to be an installation issue. But you have not provided us with your installation information. If your installation was manual/scratch and you do not provide us with a link to the installation set ... or even the OS ... nothing ... we really won't be able to do anything other than what has been done. The error specifies lack of permission to hit a specific file.
4) You only posted some of the error, so I'm not clear (offhand) whether the file in question is the one making the request which is denied or if that file is the one that can't be accessed.
5) It could be that the IP of the requester is not allowed to "hit" that php file or it could be that php file attempting to reach out and include another file which has permissions denying the request.
Happy Hunting!
PS: If you did not install with the Vicibox .iso installer, it's often useful to post WHY you chose to install with some other method. Helps us understand your situation better.