Change the message / error handling when saving "Reference Skeleton" part.

[ReneRepina]

Greetings.

It would be great to change the message / error handling when saving "Reference Skeleton" part.

Message below confuses normal users. It would be great, if it would say "Save from its assembly (Frame Generator)" or something, not like below message, which looks like some critical error, which cannot be fixed.

For our specific case, we are migrating the file database and automatic migration did not go through, due to error above and users could also not fix this specific part, because of the error / message above.

Best regards,

Rene Repina

[bob_holland]

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