Parser Error While Deploying Website to Server in Asp.net

When deploying asp.net application to host on live server or IIS server, you might get this type of parser error.

Parser error occurs while some resources are required to serve the request but not able to get the source.

Parser Error

Server Error in ‘/’ Application

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Parser Error

Description: An error occurred during the parsing of a resource required to service this request.
Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load type ‘assembly.Default’

Following might be the possible solutions to solve out this error.

Solution 1

Web Application’s “Bin” folder is missing or the application’s DLL file is missing. Check all files are
successfully copied to production server or virtual directory.

Solution 2

Your application may not have successfully compiled because Visual Studio .NET is caching an old
version of the DLL files. So, you need to re-compile or build all DLL’s before uploading to production or
IIS server.

Solution 3

1. Use IIS WebServer Configuration
2. Right-Click on your WebSite > Properties
3. Then in the “Directory”, Create your Application, Add it to your ApplicationPool and verify that your
virtual directory is mounted properly
4. Then in the “bin” directory should be seen and used with all the files under it

Solution 4

You may have deployed to the “/” (web root) directory, but have not changed some of the settings
in the “Web.config” file. So, cross check those settings

Note: In most cases issue is we forget to upload latest built DLL’s under “bin” folder or failed to upload some files on server during uploading through FTP program. So, cross check all files are successfully uploaded to server.