swift - UUIDString unexpectedly found nil -

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i working on piece of code using corelocation , clbeaconregion, i'm receiving error:

fatal error: unexpectedly found nil while unwrapping optional value

i want create region variable holding clbeaconregion so:

let region = clbeaconregion(proximityuuid: nsuuid(uuidstring: "am_2015-06-10")!, identifier: "anymorning")

a bit later in code, calling:

locationmanager.startrangingbeaconsinregion(region)

and when launch app, receive above error. right way solve this?

"am_2015-06-10" not valid uuidstring! nsuuid(uuidstring: "am_2015-06-10")! crash application

uuids (universally unique identifiers), known guids (globally unique identifiers) or iids (interface identifiers), 128-bit values.


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