Can't build my project.

[ThatLadLegend]

For any other project I've made in C# metroframework has worked flawlessly but for some reason this project just doesn't work. Everytime I try to build the project it give me this error: E:\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(4632,5): error MSB3027: Could not copy "E:\C# Themes Folder\MetroUI DLL\MetroFramework.dll" to "bin\Debug\MetroFramework.dll". Exceeded retry count of 10. Failed. The file is locked by: "Microsoft Visual Studio 2019 (12900)"

Thanks in advance.

[DannyRawlings]

I have found this to be an issue with Visual Studio in the past.

Steps I've used to solve it are, Clean the solution and the closed and reopen Visual Studio