[thredds] featureCollection error

Can someone please confirm the meaning of the following error I am
getting with <featureCollection></featureCollection>:
 
[2011-12-14T14:46:21.897+0000] ERROR ucar.nc2.ft.fmrc.Fmrc:
//fgwfnas1/data/fnl/grib1/**/.*grib$: makeFmrcInv failed
[2011-12-14T14:46:35.802+0000] ERROR ucar.nc2.ft.fmrc.FmrcInv: mixed
intervals for grid Total_cloud_cover
[2011-12-14T14:46:35.802+0000] ERROR ucar.nc2.ft.fmrc.Fmrc: makeFmrcInv
java.lang.IllegalArgumentException: mixed intervals for grid
Total_cloud_cover
 
I think it is a result of dataset files changing the dimension name from
"time" to "time1" for variable "Total_cloud_cover", but want to check.
 
Regards,
 
Glenn