Hi,
Today I had a reflection error.
All class are ok and until yesterday, I don't have any type of error.
I create a new Page B class into mysite with a class B1 that extend Image class.
Into Product Class, I just have a class with another name B2 that extend Image class.
In Admin panel when I upload image file, I have everytime reflection error that B2 class don't exist ( when I was on Page B ) or B1 don't exist ( when I was on Product ).
I resolved putting B1 and B2 into main Page class that extend SiteTree.
Bye