Can not import colors from other *.sla file

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founder

Just wanted to work on the German version of my book

Calculation ERROR.sla -> English version
Calculation ERROR german.sla -> German version

Since my last edit, I added some colors in the English version.
So as I did last time

Menu -> Edit -> Colors -> Import

In the file selection box, I select Calculation ERROR.sla
but I get an error message

The file does not contain colors that can be imported.....

I closed Scribus and restarted. Same problem.
Why did this work last month with the same 1.4.0 version?
Founder of PEGE - Planetary Engineering Group Earth https://www.pege.org
Founder and CEO of https://gemini-next-generation.house