sdk 6.9.2, while preparing database, get error - Core API is absent. You should include Core API to your project

[sunilk5893]

E/flutter (25790): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(, database preparation failed: com.regula.documentreader.api.errors.DocumentReaderException: java.lang.NullPointerException: Core API is absent. You should include Core API to your project., null, null)
E/flutter (25790): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:652:7)
E/flutter (25790): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:310:18)
E/flutter (25790):
E/flutter (25790): #2 DocumentReader.prepareDatabase (package:flutter_document_reader_api/document_reader.dart:5067:12)
E/flutter (25790):
E/flutter (25790): #3 _MyAppState.initPlatformState (package:flutter_base/myapp.dart:183:11)
E/flutter (25790):
E/flutter (25790):