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show error messages sent from server or offline message

HydroLogic/tilestream,zhm/tilestream,HydroLogic/tilestream,NolaMark/tilestream,frankrowe/tilestream,zhm/tilestream,staltz/tilestream,makinacorpus/tilestream,frankrowe/tilestream,mapbox/tilestream,NolaMark/tilestream,simonpoole/tilestream,markng/tilestream,simonpoole/tilestream,makinacorpus/tilestream,mapbox/tilestream,markng/tilestream,staltz/tilestream