Got error at trying to update a rule input

Zuuuuuuup people !

So, I'm trying to create a screen to upload files,, between 2 interfaces. Since I need to send files to process model, I need to set rule input. But, When I try it, the following message is poped up:

Is it possible to send those files without using rule input ? I've tried to set rule input at button submit click, without success.