Object reference not set to an instance of an object.

Question

Upon upgrading from Visual Studio 2019 to Visual Studio 2022 I am now unable to build our website. I am successfully able to compile our WebService but when trying to compile out Web Site I get the following error without context. The output window states "Build (web): Object reference not set to an instance of an object." and the error list states "Object reference not set to an instance of an object." with no tied project, file, or line. After an extensive amount of effort to find a solution, I have come up short. Any advice would be useful.

Answer 1

Hi @Joshua Harper , 

Welcome to Microsoft Q&A! 

Please close all running VS instances and try to delete the hidden .vs, bin and obj folders in the project folder.

Then, rebuild the solution. 

If it doesn’t work, please ensure that you install the same components or workloads in VS2022 as in VS2019.

Besides, please check its target framework and assembly references. 

Sincerely,

Anna

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