❔ error message windows form application

1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\Microsoft.Common.CurrentVersion.targets(4502,5): warning MSB3026: Could not copy "obj\Debug\MindGame.exe" to "bin\Debug\MindGame.exe". Beginning retry 10 in 1000ms. The process cannot access the file 'bin\Debug\MindGame.exe' because it is being used by another process. The file is locked by: "MindGame (8964)"