NopCommerce 2.5 Installation Problem in Shared Hosting

I deployed NopCommerce 2.5 Production Version on Shared Hosting (BigRock). App. is working fine, but when I try to Access Certain Sections like Add-Products in Administration Area, Application throws an error and redirects to error.html page. I Deployed NopCommerce Instance, NOT Installed on server.

Is this an error of File Write Permission(As its a shared hosting) or is there some other problem.

Please guide. Thanks in Advance.

error.html or ErrorPage.htm page? What is the content of this page?

Yes Andrei. Its ErrorPage.htm page. It contains No Error Message, but only Static Content :

[ We're sorry, an internal error occurred that prevents the request to complete.

Our supporting staff has been notified with this error and will address this issue shortly. We profusely apologize for the inconvenience and for any damage this may cause. You might want to try the same action at later time. ]

To find out what went wrong you need to turn off the custom errors mode.
1. Open web.config file
2. Find out the following line <customErrors defaultRedirect="errorpage.htm" mode="RemoteOnly">
3. Replace it with <customErrors defaultRedirect="errorpage.htm" mode="Off">

Is there any Problem installing NopCommerce in Shared Hosting ??

No. It works fine. If you have any issues, please post the error text

The 'PLESK-WEB10\IWPD_1505(sangesof)' account is not granted with Modify permission on folder 'D:\inetpub\vhosts\sangeetkaryalaya.in\httpdocs\App_Data'. Please configure these permissions.

The error is self-describing. Grant  'PLESK-WEB10\IWPD_1505(sangesof)' account a Modify permission on folder 'D:\inetpub\vhosts\sangeetkaryalaya.in\httpdocs\App_Data.

Yes the prob. was created because of not granting file write permission.