I got this same error just downloading a fresh copy of 1.5 with source code and trying to run it in Visual Studio. The manual says this should work and that it should just start the installation wizard.
Or do we need to set up the database and connection string first?
I had the same problem with a web server with Parallels Plesk Interface (Plesk 8.2 for Windows) and I solve the problem:
1 - On Plesk interface go to ASP.NET Configuration. Click on Set to Default. Click OK.
2 - (optional) If you want check errors, change Custom error mode to Off. Do the same on web.config file.
3 - On Plesk interface go to Web Directories. There exist also a ASP.NET Configuration, by default assume the changes you had made. So go to Preferences. There check: - Script source access - Read permission - Write permission - Allow to use parent paths - Allow application execution in MTA
Click OK to exit
4 - Change permissions to images folder (full control) to Plesk IIS User (IUSR_) and Plesk IIS WP User (IWAM_plesk)
5 - Now edit web.config file and find: <providers> <add name="NopRoleManagerSqlProvider" type="NopSolutions.NopCommerce.BusinessLogic.Profile.StoreRoleProvider, Nop.BusinessLogic" connectionStringName="NopSqlConnection" applicationName="NopCommerce"/> </providers>
8 - After you finish the installation, change email admin and password, and click go to store. If you are redirect to the install page... then goto to Step 1 and remove the Default Connection strings from the ASP.NET Configuration page.
Good luck Bento
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