non-numeric argument error in sqrt(dfaflux)/image.env$gain

[rrgupta]

Hi,

I am running measure.fluxes() on a list of images (GALEX, SDSS, HST, PS1) using LAMBDAR v0.20.0 but no matter the order I run them in, I'm getting the following error at the end of my log files after sky subtraction:

Perfoming Sky Subtraction
   - Done

Error in sqrt(dfaflux)/image.env$gain : 
  non-numeric argument to binary operator

I've also found that this error doesn't occur when I run measure.fluxes() on a simulated image (which has a real PS1 header). Not sure if that helps pinpoint the issue. Any idea what could be causing this?

Thanks,
Ravi