Error in Image Integration with SSWEIGHT keyword

[nmontec]

Dear All,

I get sistematically this error:

*** Error: D:/tmp/VdB24_L__0000_c_cc_a_r.xisf: Nonexistent or invalid weight keyword 'SSWEIGHT'.

The keyword is existent and I assume its value is valid as it comes from the subframe selector.
See attached the screenshots related to the error and the fits keyword as it appears on the header

Can you please help me?

Thanks a lot
Nicola

[mschuster]

Negative weights are not allowed.

Thanks,
Mike

[nmontec]

Negative weights are not allowed.

Thanks,
Mike

Thank you! I wonder how come they come out that way...