System.Web.HttpException: Could not load type 'CSW.Web.Security.NDMSMemberProvider'.

Question

I keep getting this error when I deploy to staging. Everything works fine on my local and just to add, the production version works too. The problem is, when a user(in this case test user) trys to login into the app, the error is thrown. I have managed to recreate the errror in code and fixed to work but when I deploy the nightmare continues. Below is the part in the config file that causes the error

Line 150:      <providers> 
Line 151:        <clear/> 
Line 152:        <add name="NDMSMembershipProvider" 
                          type="CSW.Web.Security.NDMSMemberProvider"/> 
Line 153:      </providers>