Copying file bin\WebApplication .dll to obj\Release\AspnetCompileMerge\Source\bin\WebApplication .dll failed. Could not find file 'bin\WebApplication .dll'

If you get the following error while publishing
Error 9 Copying file bin\WebApplication3.dll to obj\Release\AspnetCompileMerge\Source\bin\WebApplication3.dll failed. Could not find file 'bin\WebApplication3.dll'. 0

open application.csproj file in notepad
and see if you have Webapplication#.dll and .pdb file in the csproj file
remove them from the csproj

<ItemGroup>
    <Content Include="bin\ProjectName.dll" />
    <Content Include="bin\ProjectName.pdb" />
    <Content Include="bin\WebApplication3.dll" />

    <Content Include="bin\WebApplication3.pdb" />

   <Content Include="bin\WebApplication3.dll.config" />


we can publish it now