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Please see the official X‑Plane Support page for help.
I am not from Laminar Research; just a flight simmer from downunder.
My assumption is "soft clouds: is a third party add-on feature. I have not seen anything or heard anything about this program or file. My suggestion would be to delete this 3rd party software.
Once done then run the X-Plane Installer file again. By doing so, files that have been corrupted or are missing from the original installation will be replaced and or installed. This should give you a "clean skin" installation. Then try starting X-Plane again.
If it runs without a problem then install your "soft clouds" software and then test the added software. If X-plane runs then all should be "OK' . If not then the added software is the cause of your problem.
Provided you are running the genuine, original and official version of X-Plane rather than the 3rd party hybrid modified version of X-Plane then attach your log.txt file as it may provide other additional information.
To attach the file follow the advice provided in the following link found at https://questions.x-plane.com/?qa=blob&qa_blobid=17830136656522860642
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