Hello people, i need your help because i dont know why after download some plugins (i cant remember which one) the functions doesnt work more... I tried to change most of options and cant repair it.
Im new at this, so i would be very happy if u can help me.

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Function Error.sm (3 MiB) downloaded 61 time(s).

Seems you have some outdated plugins.

Go to Tools > Plugins and try to uninstall every custom plugin.

If this option is not available in your SMath Studio:

• Close your SMath Studio
  
• copy & paste %APPDATA%\SMath\extensions\plugins in the search field of your start menu and press enter
  
• delete eveything in that folder
  
• open SMath and download again the plugins you need
  

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Sorry, but I tried to find the solution yesterday and today, when I found the answer you've already answered ...
This is the post:
http://en.smath.info/forum/yaf_postst2752_IF-function-error.aspx#post14902

I did the same you say, delete all documents in the folder and the problem was solved.
Again you save me Davide, you people, are awesome!