reason of `unrecognized selector sent to instance` error

why am keep getting this error while just saving a object error :
unrecognized selector sent to instance 0x15eb65300
2016-07-16 02:00:24.891 PB[3839:1213144] *** Terminating app due to uncaught exception
‘NSInvalidArgumentException’, reason: ‘-[PB.Request getVersion]: unrecognized selector sent to instance 0x15eb65300’
i’m trying to save this object

let request = Request()
request.two_Request = “MY STRING”
request.onew_Request = “MY VALUE”

let dataStore = // getting error in this line

// save object asynchronously
response: { (result: AnyObject!) -> Void in
print(“Request has been saved”)

error: { (fault: Fault!) -> Void in
print(“fServer reported an error: (fault)”)
my Request Class :
class Request : NSObject {

dynamic var college_Request : String?
dynamic var university_Request: String?

Please remove “dynamic” in Request class.

@Vyascheslav i tried as you suggested but the error is still here

Please provide your appId here or to

@Vyacheslav now its working , i created a table with different name