Error message "Le paramètre n'est pas valide" (something like "parameter is not valid")

Question

Hi to all, 
 I downloaded an update this week and since then, I have an error message every 2 or 3 minutes when I'm translating. 
 The message says "Le param&egrave;tre n'est pas valide" (something like "parameter is not valid"). It blocks the program, I can't enter any text anymore, I have to close and reopen Trados but it keeps starting over again. 
 Anyone in the community who knows how I can fix this? 
 Any help would be much appreciated, 
 Thanks, 
 Inge

Marie Le Guitton · Answer

Hi Paul, 
 I have got the same error message "Parameter is not valid" than Inge Julien. It often appears when I enter a "d" or a "l" or when I use the shortcut to insert a tag. 
 I noticed it appears since I downloaded and installed SDL Trados Studio 2019 SR1. 
 Could you please help me to solve this issue? 
 I tried the solution of Alison Field (repair Studio from the Control Panel) but it did not work. 
 I downloaded and installed SDL Freshstart and repaired all the SDL files/folders listed in this app' but it did not work too. 
 I renamed 2 of the 3 roaming folder I have, but I still get the error message "Parameter is not valid"... 
 I will really appreciate your help! 
 Thanks in advance 
 Marie

Paul · Answer

Hi Inge Julien 
 
You could use this app for the reset and this will also explain what you will lose by carrying out a reset before you do it. As you said the update was this week I'll assume you are using Studio 2017: 
 
 appstore.sdl.com/.../ 
 
But if you'd rather do this manually then rename this folder (just add _old to the end or something, it's not important what you rename it to) and restart Studio: 
 
c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\14.0.0.0 
 
So the path would become this: 
 
c:\Users\[USERNAME]\AppData\Roaming\SDL\SDL Trados Studio\14.0.0.0_old 
 
If you can't find this folder then you need to unhide your hidden files/folders: 
 
 www.howtogeek.com/.../

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Error message "Le paramètre n'est pas valide" (something like "parameter is not valid")