MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)

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I get this error when I initialize the DioCacheManage with no databasePath option.

DioError [DioErrorType.DEFAULT]: MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite)

When I pass the option, I get

DioError [DioErrorType.DEFAULT]: FileSystemException: Creation failed, path = '/assets' (OS Error: Read-only file system, errno = 30)

Don't know what I'm doing wrong though. Will appreciate any help. Thanks.