Use a type generated from reflection as a generic type parameter?

I am getting the type to set from a string via

var resultingType = Type.GetType(stringOfType); 

and this works giving the correct type.

Then I am using caliburn.micro database mapping to try to pull the class (a table in a database) so

repo.GetQueryable<resultingType>.Where(e => e.id =1)

I'm not sure if the caliburn.micro is important but it WILL NOT let me call on resultingType. What am I doing wrong?