Compiler Error CS1504
Source file 'file' could not be opened ('reason')
A source file could not be opened or read by the compiler. The file may be locked by another application, or there could be some other operating system problem. The message includes the operating system's reason for why the compiler could not open or read the file.
Collaborate with us on GitHub
The source for this content can be found on GitHub, where you can also create and review issues and pull requests. For more information, see our contributor guide.
.NET feedback
.NET is an open source project. Select a link to provide feedback: