Sorry, the last part of the message:
The last time that happened to us this, trying to recreate the error
that I have sent to you in another message, after giving that error, I
created a new project, after, without doing anything else, what happened
is exactly what that you see in the video.
I wanted to say about the other error:
Object reference not set to an instance of an object - #2 by ck
but, no, we have not deleted any .vs/.suo file.