Error in start Session

[nishant-techindustan]

Hello,
I am getting error on session start Error Domain=com.comapi.foundation.request.template Code=5554 "(null)

I'm using this code to initialise and start session:
let config = ComapiConfig.builder()
.setAuthDelegate(self)
.setApiSpaceID(apiSpaceId)
.build()
guard let client = Comapi.initialise(with: config) else {
print("client initialise error")
return
}
client.services.session.startSession {
print("session created successfully")
} failure: { (error) in
print("error on session creation >>>>>> (error!)")
}