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answer [error:flutter/runtime/dart_vm_initializer.cc(41)] unhandled exception: type 'null' is not a subtype of type 'string'

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/flutter (23157): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(null-error, Host platform returned null value for non-null return value., null, null)`

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Fix the following flutter issues. : 1. The body might complete normally, causing 'null' to be returned, but the return type, 'int', is a potentially non-nullable type. 2. Expected a class member. 3.Variables must be declared using the keywords 'const', 'f

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