C# SSIS Script component - Save List String to Object package-scope variable and read it in Script Task

Question

before posting this i was searching this on internet but was not able to find info regarding my specific case:
i have a DataFlow Task with "Error output" pointing from FlatFile to
Script Component that does below (variable "ErrorMessageList" is listed under ReadWriteVariables property):
List<string> lsErrors = new List<string>();
public override void Input0_ProcessInputRow(Input0Buffer Row)
lsErrors.Add("test1");
lsErrors.Add("test2");
    void PostExecute()
        base.PostExecute();
        Variables.ErrorMessageList = lsErrors;
Then the DataFlow points to a ScriptComponent where this object variable is listed under ReadOnlyVariables property and does the below:
public void Main()
List<string> lsErrors = (List<string>)Dts.Variables["ErrorMessageList"].Value;
and that is where i get exception-has-been-thrown-by-the-target-of-an-invocation
What is wrong here?
(i have mistakenly edited this first post before, so i tried to manually put it back to original version)

Answer 1

i have missed the "override" keyword...
public class ScriptMain : UserComponent
public class UserComponent: ScriptComponent
namespace Microsoft.SqlServer.Dts.Pipeline
public class ScriptComponent
// i should have seen this before
public virtual void PostExecute();
i believe i must have deleted the PostExecute method definition right after the ScriptComponent generated the script for me... and then when i've realized that i can't change ReadWriteVariables as a part of:
public override void Input0_ProcessInputRow(Input0Buffer Row)
// --- can't change ReadWriteVariables here
then i had to add the method back but forgot that the base method is virtual
thanks for this hint, Russ!