Bluetooth Pairing Request

[drunisa007]

when I accept PAIR from notification.it disconnect automatically and show below error.
E/flutter (31836): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: PlatformException(not connect, state not right, null, null)
E/flutter (31836): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:582:7)
E/flutter (31836): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:159:18)
E/flutter (31836):
E/flutter (31836): #2 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:332:12)
E/flutter (31836): #3 BluetoothPrint.printReceipt (package:bluetooth_print/bluetooth_print.dart:141:14)
E/flutter (31836): #4 _MyAppState.build. (package:test_another_library/main.dart:157:48)
E/flutter (31836):
E/flutter (31836): #5 _MyAppState.build. (package:test_another_library/main.dart)
E/flutter (31836): #6 _InkResponseState._handleTap (package:flutter/src/material/ink_well.dart:993:19)
E/flutter (31836): #7 _InkResponseState.build. (package:flutter/src/material/ink_well.dart:1111:38)
E/flutter (31836): #8 GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:183:24)
E/flutter (31836): #9 TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:598:11)
E/flutter (31836): #10 BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:287:5)
E/flutter (31836): #11 BaseTapGestureRecognizer.handlePrimaryPointer (package:flutter/src/gestures/tap.dart:222:7)
E/flutter (31836): #12 PrimaryPointerGestureRecognizer.handleEvent (package:flutter/src/gestures/recognizer.dart:476:9)
E/flutter (31836): #13 PointerRouter._dispatch (package:flutter/src/gestures/pointer_router.dart:77:12)
E/flutter (31836): #14 PointerRouter._dispatchEventToRoutes. (package:flutter/src/gestures/pointer_router.dart:122:9)
E/flutter (31836): #15 _LinkedHashMapMixin.forEach (dart:collection-patch/compact_hash.dart:377:8)
E/flutter (31836): #16 PointerRouter._dispatchEventToRoutes (package:flutter/src/gestures/pointer_router.dart:120:18)
E/flutter (31836): #17 PointerRouter.route (package:flutter/src/gestures/pointer_router.dart:106:7)
E/flutter (31836): #18 GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:358:19)
E/flutter (31836): #19 GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:338:22)
E/flutter (31836): #20 RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:267:11)
E/flutter (31836): #21 GestureBinding._handlePointerEvent (package:flutter/src/gestures/binding.dart:295:7)
E/flutter (31836): #22 GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:240:7)
E/flutter (31836): #23 GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:213:7)
E/flutter (31836): #24 _rootRunUnary (dart:async/zone.dart:1206:13)
E/flutter (31836): #25 _CustomZone.runUnary (dart:async/zone.dart:1100:19)
E/flutter (31836): #26 _CustomZone.runUnaryGuarded (dart:async/zone.dart:1005:7)
E/flutter (31836): #27 _invoke1 (dart:ui/hooks.dart:265:10)