[Geoserver-users] Time for a geotiff imagemosaic

Hello,

I'm currently having a hard time to get "Time" working with a geotiff
imagemosaic.
I have the same problem as here:
http://osgeo-org.1560.n6.nabble.com/image-mosaic-td5012125.html

my my_mosaic.properties looks like this:

TimeAttribute=time
Schema= the_geom:Polygon,location:String,time:java.util.Date
PropertyCollectors=TimestampFileNameExtractorSPI[timeregex](time)

my timeregex.properties
regex=[0-9]{8}

but on creation of the store there's an error:
"Could not list layers for this store, an error occurred retrieving
them: Argument "value" should not be null."

I can create the store without giving it a properties file, and there
it works fine.

Any idea what i need to do?
Or can anyone provide a test set which should work?

Thanks in advance,
Felix