Modules become red

[CoreStyler]

Hi people.
I createad an algorigthm of integer number that do operations ( * and +) but it is displayed RED.

red mods.PNG

What mean? is a debugging tool?

The operators works good, and the entire stuff works well.. Did i used too big numbers?

[infuzion]

What mean? is a debugging tool?

Yes; you have a trigger feedback loop. This started around SM2.0.

[lesobrod]

Firstly, OSM please (or a part with red!). The problem may be weird enough.
Here the most simple way to get "red":

red.png

Roughly speaking, attempt to get some values before it makes sense is a contradiction.

It seems to me that is general rule; but in complex and wide schematics,
there may be alike but "hidden" problems. So problem may be even
in not a module that "red" but somewhere close by..

[CoreStyler]

Found. it was under the primitive "int multy. so i haven't see it. tanks