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Then system information. Right click in the new window, select all, then copy and paste all that here.
Top of the Steam UI on the left. See that "steam view friends games help >"? Click on the help bit
Steam for Mac
https://steamcommunity.com/discussions/forum/2/
If it is a error you have seen on Steam, chances are, so has someone else. Therefore, the forum search would show those threads.
And you can look at them from that search for possible solutions.
The link was not to show you how to fix anything, directly. It was a link to a better forum.
EDIT....................
For example, I just did a quick search and got lots of hits :
https://steamcommunity.com/discussions/forum/search/?gidforum=882959061466928569&include_deleted=1&q=Platform+error%3Abad+module
https://steamcommunity.com/discussions/forum/2/1735466157773277443/#c3145094199294247719
Have you tried to repair Steam ?
https://support.steampowered.com/kb_article.php?ref=3352-RYON-4107
Reinstall Steam
The Steam installer can be downloaded here: http://store.steampowered.com/about/ and reinstalled to the same location where it is already installed.
This may fix potential issues with Steam client and service files. Installing into same location will preserve all installed games.
WARNING! Uninstalling Steam through any other method will delete all game and userdata content.
mac
Because most that post here are going to be Windows users. And that post is in a "Steam for Mac" thread, so I was just passing it along from my search result.