Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via GitHub by jayrambhia
, 1 year ago
Attempt to invoke virtual method 'io.socket.emitter.Emitter io.socket.engineio.client.Transport.once(java.lang.String, io.socket.emitter.Emitter$Listener)' on a null object reference
via GitHub by hamberluo
, 1 year ago
Attempt to invoke virtual method 'io.socket.b.a io.socket.engineio.client.c.b(java.lang.String, io.socket.b.a$a)' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'io.socket.emitter.Emitter io.socket.engineio.client.Transport.once(java.lang.String, io.socket.emitter.Emitter$Listener)' on a null object reference at io.socket.engineio.client.Socket$7.call(Socket.java:336) at io.socket.emitter.Emitter$OnceListener.call(Emitter.java:164) at io.socket.emitter.Emitter.emit(Emitter.java:117) at io.socket.engineio.client.Transport.onOpen(Transport.java:115) at io.socket.engineio.client.transports.WebSocket.access$100(WebSocket.java:32) at io.socket.engineio.client.transports.WebSocket$1$1.run(WebSocket.java:82) at io.socket.thread.EventThread$2.run(EventThread.java:80) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818)