Unable to find ID: checkbox_2 error message

[danj]

I am working on a sequence I have been developing on & off for a few weeks now.  I wanted to try to tweak my lightning NC effects on my megatrees  but whenever I select that effect, I get an "unable to find ID: checkbox_2" error message.  I selected several other NC effects in this sequence and I only get this error message when I try to select "lightning" so my problem seems to be limited to that one effect.  Any ideas?

I attached the xml files.
THANKS

[Gilrock]

That usually happens when we change a parameter to an effect.  Since Sean made a couple updates it's possible a name got changed so the easy fix is select the effect and make a change or hit the Update button and then Save the sequence and it should update to the new settings and eliminate that old setting.