ios - Firebase storage error -

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firebasestorage pod version (1.0.1)

var storageref: firstoragereference! = firstorage.storage().reference()   let uploadtask = storageref.putdata(uiimagepngrepresentation(image)!, metadata: nil) { metadata, error in         if (error != nil) {          } else {             let downloadurl = metadata!.downloadurl             print(downloadurl)         } }

i selected image imagepicker , tried save image data firebase storage. illustrated in firebase docs.(docs reference) upload data in memory section.

it's throwing following error:

*** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '*** -[__nsplaceholderdictionary initwithobjects:forkeys:count:]: attempt insert nil object objects[1]' *** first throw call stack: (     0   corefoundation                      0x02025494 __exceptionpreprocess + 180     1   libobjc.a.dylib                     0x03eb2e02 objc_exception_throw + 50     2   corefoundation                      0x01f0c6d2 -[__nsplaceholderdictionary initwithobjects:forkeys:count:] + 386     3   corefoundation                      0x01f2095b +[nsdictionary dictionarywithobjects:forkeys:count:] + 75     4   fireplay                            0x001e42bc -[firstorageuploadtask enqueue] + 815     5   fireplay                            0x001e010c -[firstoragereference putdata:metadata:completion:] + 880

the same code used work before. not sure what's problem now.

turns out can't put files in root storage node. need create child node , can save file. mentioned in firebase docs somehow overlooked it.

e.g 

let mountainsref = storageref.child("mountains.jpg")  let uploadtask = mountainsref.putdata(uiimagepngrepresentation(image)!, metadata: nil) { metadata, error in         if (error != nil) {          } else {             let downloadurl = metadata!.downloadurl             print(downloadurl)         } }

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