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When I use darkcombine , it says" Error : No bad pixel mask found" , could you tell me the reason.Thank you for your help!

Hello,You must be specifying a parameter that is expecting to find a bad pixel mask. Please respond with the parameter listings for darkcombine and for ccdproc. You may not have realized that darkcombine may run ccdproc prior to combining depending on the parameters. In this case you may not have checked the ccdproc parameter are appropriate for your data.Yours,
Frank Valdes

Hi,
I have the same problem using imred, ccdred, flatcombine

PACKAGE = ccdred
TASK = flatcombine

input = *.fit List of flat field images to combine
(output = masterflat) Output flat field root name
(combine= median) Type of combine operation
(reject = none) Type of rejection
(ccdtype= none) CCD image type to combine
(process= yes) Process images before combining?
(subsets= yes) Combine images by subset parameter?
(delete = no) Delete input images after combining?
(clobber= no) Clobber existing output image?
(scale = mode) Image scaling
(statsec= ) Image section for computing statistics
(nlow = 1) minmax: Number of low pixels to reject
(nhigh = 1) minmax: Number of high pixels to reject
(nkeep = 1) Minimum to keep (pos) or maximum to reject (neg)
(mclip = yes) Use median in sigma clipping algorithms?
(lsigma = 3.) Lower sigma clipping factor
(hsigma = 3.) Upper sigma clipping factor
(rdnoise= 0.) ccdclip: CCD readout noise (electrons)
(gain = 1.) ccdclip: CCD gain (electrons/DN)
(snoise = 0.) ccdclip: Sensitivity noise (fraction)
(pclip = -0.5) pclip: Percentile clipping parameter
(blank = 1.) Value if there are no pixels
(mode = ql)



ccdred\$this->_split2($m[0]) flatcombine
List of flat field images to combine (*.fit):
ERROR: No bad pixel mask found
"ccdproc (ims, output="", ccdtype=ccdtype, noproc=no)"
line 38: ccdred$flatcombine.cl
called as: `flatcombine ()'
ccdred\$this->_split2($m[0])

Do not know how to fix this.

Thank you,

Pam