For MS2 chromatograms, the "Chromatogram Information Unavailable" typically means that there were no MS2 spectra in the .raw file which matched the precursor m/z.
One reason that this could happen with a PRM method is that the mass spectrometer method really did not include the precursor m/z that you needed. Sometimes that m/z was included in the method, but it is not exactly the same as what Skyline thinks the m/z is. The closeness that the m/z in the .raw file and in the Skyline document need to be is controlled by the "Method match tolerance m/z" setting at "Settings > Transition Settings > Instrument".
Another thing to check is the "Retention time filtering" setting at "Settings > Transition Settings > Full Scan". For a PRM method, that should typically be set to "Include all matching scans" because your instrument method has already told the mass spectrometer when you want data collected for your molecules of interest and you want Skyline to make use of all of the available spectra.
Another thing to check is whether you have set the "Explicit Retention Time" on any of your molecules. If the extracted chromatogram does not overlap with the explicit retention time then Skyline discards the chromatogram.
If you would like you can send us your Skyline document and some of your .raw files and we can tell you what is going on.
In Skyline you can use the menu item:
File > Share
to create a .zip file containing your Skyline document and supporting files including extracted chromatograms. The "Share Skyline Document" dialog also allows you to include .raw files in the .zip file, or you can upload them separately.
Files which are less than 50 MB can be attached to this support request. You can upload larger files here:
https://skyline.ms/files.url
-- Nick