Http binding question - cache not working

I have the same error:

[ERROR] [ab.binding.http.internal.HttpBinding] - given config key 'format' does not follow the expected pattern '<id>.<url|updateInterval>'

and my configuration is:

MKTronic.url=http://192.168.2.20/status.xml{Authorization=Basic YWRtaW46YWRtaW4=}
MKTronic.updateInterval=2000

and usage:

String Relay1Status { http="<[MKTronic:2000:REGEX(.*?<relay1>(.*?)</relay1>.*)]" }