Working with CodeDress and if you get this error "No suitable constructor found" check the following:

• In the GAC check that you only have the current Eco.Interfaces - and not any old copies of the assembly - and that the GACed version is the version in MDrivenServer/bin: C:\Windows\Microsoft.NET\assembly\GAC_MSIL\Eco.Interfaces
• Also check the CodeDress assemblies (\ModelCodeAssemblies) so that you do not have any Eco.* assemblies there - the linker will wrongfully mix in these instead of the ones in your running application (Turnkey or MDrivenServer)
• When the linker tries to resolve the reference to Eco.Interfaces - it may end up with the wrong one and then nothing matches up correctly and we have no access to the correct contstructor.
• This issue does not normally arise on the server since you probably have not installed MDrivenFramework there. The problem arises due to a fight on what version to use between MDrivenFramework (that must GAC assemblies to allow for VisualStudio to work) and MDrivenServer that does not GAC assemblies.

I Visual Studio doing "Clean" on your solution and rebuilding usually helps.

Play - button in MDriven Designer gives exception "No suitable constructor found"

When you hit play the system tries to start - as part of system start we look for CodeDress assemblies. If you model is saved in such a location so that the codedress logic will need to scan irrelevant assemblies it may be the reason for the "No suitable constructor found"-exception. Try and move your model to a directory of its own where codedress logic will not find other irrelevant files.