I have the same problem.
I did reinstalling of the trados studio and removing of "base settings", "Usersettings", and "plugincahce".
However, the problem didn't solved.

Hello @정 철우   Arya Hajiali Larijani Sandor Juhasz Lydia Chessum Anna Moorby

Can i confirm whether you have installed SDL Machine Translation cloud please?

You may also find the following article useful-

https://gateway.sdl.com/apex/communityknowledge?articleName=000016859

Hi there 

I have downloaded the plugin today as a temporary replacement but would be good to find out what’s happening with language cloud too.

thanks 

Hello.
when I use "SDL Machine Translation Cloud", machine translation is worked well.
However, when I use "SDL Language Cloud", the problem I mentioned above occurs.
I mainly use "SDL language Cloud" because I use "translation engine" in which the translation memory what I made and the machine translation provided by SDL are included.
Additionally, I checked the article you mentioned and I tested 'pre-translate' in the batch task menu.  In this case, the machine translation was worked well.
However, using the machine translation for each segment is still not worked.

Thanks for the tip - it worked.

I found that the machine translation(SDL language cloud) is working well today.
I don't know how the problem is solved, but I think the problem was a temporary problem.
Thank you Steven Whale.

Hi,
MT enhanced plugin is no longer compatible with the latest trados studio version.

Hi,
MT enhanced plugin is no longer compatible with the latest trados studio version.