Error ..Could not load the assembly 'App_Web_4giibxae'. Make sure that it is compiled before acce... I have developed one website in ASP.NET 2.0 and it is wroking fine in my development server(Local server only installed ASP.NET 2.0). Then I have published this site. I uploaded published copy to our Production server( Shared server ). when I try to access my index page receiving the following error Could not load the assembly 'App_Web_4giibxae'. Make sure that it is compiled before accessing the page I am using one Masterpage for all other pages and  also using some class files. I searched this error in google and found one of the issue and solution is.. if two versions of the ASP.NET installed(ASp.NET 1.1 and ASP.NET 2.0) and not created separate pool in IIS 6.0 for each version and assigned each application then this error will happen. I contacted with my hosting provider and they are telling they have separate pool for each version.And also telling some other customers also installed some website which is developed in ASP.NET 2.0 and they don't have any issue and working fine their websites. I also uploaded my published version of the website to another machine and ASP.NEt 1.1 and ASP.NET 2.0 installed on that machine and IIS 5.1 is running on that machine. i am receiving the same error on that machine also. I don't know how to create separate pools in IIS 5.1 and can we create pools in IIS 5.1?to test this is the case.