We show you how to fix Object reference not set to an instance of an object error prompt which you may see in Microsoft Visual Studio.

What is the current behavior? This only happens on the IIS server and not my Visual Studio machine. I get the following stack trace when I try to run the XlWorkbook.SaveAs(memoryStream) extension.

The Object reference not set to an instance of an object error is a common Windows issue from Microsoft Visual Studio. This error occurs when a Visual Studio object is absent, null, or inaccessible.

Excel was installed without admin rights. Conflicting plugins. Corrupt Excel installation. Variable or object hasn’t been defined correctly.

Object reference not set to an instance of an object. Copy errors encountered, copying will continue: 1 error(s) reported. Copied: PSD001:\Selection Profiles with Replace option Copied standard ...