Google Closure MSBuild Task Error

I am trying to write a custom task in my MSBuild file to compress some js files with Google Closure Compiler. I downloaded the ClosureCompiler.dll and ClosureCompiler.tasks files from the site and have kept them in a folder on my m/c. I added the below lines in my csproj file

<Import Project="C:\Projects\Closure\ClosureCompiler.tasks" />
<Target Name="AfterBuild">
    <ItemGroup>
        <JS Include="test.js" />
    </ItemGroup>
    <ClosureCompiler CompilationLevel="SIMPLE_OPTIMIZATIONS" SourceFiles="@(JS)" SourceExtensionPattern="\.js$" TargetExtension=".min.js" />
</Target>

The test.js file is kept on the root of my project files. I do not want to include the optional ApiUrl since I want to compress files locally using ClosureCompiler.dll. The ClosureCompiler.tasks file is

<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003"&gt;
    <UsingTask TaskName="ClosureCompiler" AssemblyFile="C:\Projects\Closure\ClosureCompiler.dll" /> 
</Project>

However when I try to compile the project, it gives me an error:

Compilation Failed: test.js, Reason: Object reference not set to instance of an object

Can anyone help as to what is the issue or what am I doing wrong?

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Google Closure MSBuild Task Error

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