Indeed I had the master image with the slaves, now everything works without error.
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That’s how I solved it:
from the stack_deb just delete the duplicates of i_mst,q_mst and Intensity_mst, and the error will no longer appear and you can export the pair made with Master-Master
Obviously this step is if you do it manually and not using xml or script_python 
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hi, I’m adding this topic conversation because I am having a similar problem with coregistration of two ALOS-2 slc images and this is the only place I saw it mentioned. I have used the coregistering procedure many times with different ALOS-2 images, however, about a week ago the msg in the graphic started appearing when executing the read tab in the coregistration procedure. The band mentioned in the error is an earlier product of processing the two images (a month or more ago) but that product does not reside on the workstation at this point. the folder names differ from those used previously. I put the master and slave in separate folders, however, the error persists. I convert the bands saving each step before processing. I have also reloaded the original slc images in case the original files were corrupted, however, the same msg occurs. the final product is the interferogram. thanks
are these dual-pol data?
hi, yes, HH, HV. I did not subset the bands. thanks
please first use “Select Band” to reduce your images to HH before you coregister them. This not only saves time and disk space, but also prevents these naming errors. The cross polarization channel does not bring interferometric benefit for most InSAR approaches. Effect of polarization on interferometric products
hi ABraun, I subset the two images and included the Band Select to just keep the HH band. I got the error shown on coregistration screen shot below… 
can you please include larger screenshots?
sorry, the larger screen shots attached…
have you stored both images to BEAM DIMAP forma after creating the subsett?
hi ABraun, yes, both were subsets were saved as dim files
And which parameters are selected under Warp?
hi, ABraun, the coregistration failed at the product read tab. I’m not sure why the error includes “Warp.”
Actually, the message states that the error comes from the Warp tab, but it is displayed already when you open the data so it could be related to the metadata. Please show the Warp tab
please reduce the interpolation to bilinear
thanks ABraun
reduced the Warp interpolation to linear (no bilinear option) got the same error at the Product Read.
I really don’t understand this. Did you store the ALOS-2 subsets in BEAM DIMAP format?
Maybe like this:
- open the raw data
- apply Raster > Data Conversion > Band Select
select HH here, nothing else, and write to file - coregister the band subsets.
hi, yes, the subsets were stored in the DIMAP format. I did not follow - apply Raster > Data Conversion > Band Select. I loaded the raw image files, converted the virtual bands of the raw image files and saved the image files as 'dim" files. I then subset each of the image files Raster>Subset and selected the i_HH, q_hh, intensity_HH in Band select and the region of the image containing the AOI and subset and saved as “dim” files. I entered these into Radar>Coregistration where the error appears.
and were you able to display these subsets correctly? My feeling is that some information were lost during the band and spatial subset. Therefore I suggested to use the operators for it.