Well, for starters, as has been mentioned in topics such as the one below, Elementor may not work well at all on free hosting, or cause you to get suspended for heavy usage easier.
As for your issue, it’s likely caused by an older Elementor addon that’s attempting to use functions that have been deprecated. You can have a look at the following discussions to try and find the culprit and see if it is you that has an outdated version or if you need to ask the plugin maintainer to update theirs: