Asp.net webapi 2 dependency injection giving error that

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C#

WebAPI2

dependency-injection

Hi I am using unity container for depency injection by attributes using following code

container.RegisterTypes(
                                   AllClasses.FromLoadedAssemblies()
                                       .Where(t => t.GetCustomAttributes<abcAttribute>(true).Any()),
                                   WithMappings.FromMatchingInterface,
                                   WithName.Default,
                                   WithLifetime.PerThread);

Problem is sometimes i get following exception which goes if i clean and rebuild the solution. am i missing something ?

An error occurred when trying to create a controller of type 'ABCController'. Make sure that the controller has a parameterless public constructor.","ExceptionType":"System.InvalidOperationException

What I have tried:

 tried creating parameterless constructor but again get same exception. the exception does not occur when solution is cleaned and build for the first time
<pre>public ABCController()
        {

        }