Adobe Illustrator – Invalid numeric value

Hi,
Strange problem with my Adobe Photoshop, in color tab when input 255 in R an error with the Invalid numeric value. I have this error only in R color with G and B it works fine. It worked fine before, but now I have some error in Photoshop. Does anyone know how to solve this ? What it means and why I have this now ?
Thank you !

Adobe Illustrator
Invalid numeric value.
