multiple axes error

What does it mean? or what is wrong with my masters? I have the Masters: Regular- Bold and RegularWide and BoldWider. Every time when I want to export my font as a variable .ttf a window is appearing with tthe text:

• VARTESTVF.ttf

< Core

In der Glyphe: notdef: Master is outside of the interpolation space at 840 and axis rage: 0-

what is wrong because my max. Width value is 840. I hope you understand everything my english is not the best.

best regards

Simon

Can you check that the weight setting in the two Regular vs Bold masters and the width setting in the normal vs wider masters are the same. The four masters need to form a rectangle.