Method Not Found from Loaded Assembly

Clash Royale CLAN TAG#URR8PPPMethod Not Found from Loaded Assembly
I have an application that loads the assembly of another application and invokes methods from that assembly for test purposes. Below is a generic example of this code.
testAssembly = Assembly.LoadFrom( path );
var classes = testAssembly.GetTypes();
Type mainForm = classes.Where( c => c.Name == "MainForm" ).SingleOrDefault();
var form = Activator.CreateInstance( mainForm, null );
Type secondForm = classes.Where( c => c.Name == "SecondForm " ).SingleOrDefault();
var sf = Activator.CreateInstance( secondForm , new object { form } );
MethodInfo secondFormMethod = eventList.GetMethod( "SecondFormMethod " );
secondFormMethod.Invoke( sf, new object { } );
This works to a point. The issue is that when the method is fired it eventually leads to a library referenced from the secondFormMethod and comes back with a "Method not found" error.
None of my references seem to be broken in either application.
This method works when fired from the second application I am trying to manipulate.
Not sure what I might be doing wrong.
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