Ok, so, your st is having compilation issues and hence no object has been created on the server and hence the error of DLL.
You need to add return(0) in your onSet hook
There is a function add.show.condition.to.where.testbod()
I am not sure what is it doing there? So, probably, you need to check it and fix it.
Once, you fix these errors and try to regenerate the implementation, it should work fine.
Unless you try to do something beyond what you have already mastered, you will never grow!