DioError [DioErrorType.other]: TlsException: Failure trusting builtin roots (OS Error: CERT_ALREADY_IN_HASH_TABLE(x509_lu.c:356), errno = 0)

[Nickkorol]

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Issue Info

Info	Value
Platform Name	flutter
Platform Version	2.0.5
Dio Version	4.0.0
Android Studio / Xcode Version	Android Studio 4.0 / Xcode 12.4
Repro rate	all the time (100%)

Issue Description and Steps

In my app I am using API, which requires .pem certificates to work properly. They are set when my http client is initialized (method definition on a screenshot below).

Dio works fine with this client, but, when I am trying to provide CancelToken to my API Query, I am always getting an error DioError [DioErrorType.other]: TlsException: Failure trusting builtin roots (OS Error: CERT_ALREADY_IN_HASH_TABLE(x509_lu.c:356), errno = 0)

This error doesn't appear, when I am sending POST or GET queries to any other URLs, which don't require certificates to work.

What can I do about that? Is there a way to fix this error myself?

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. If this is still an issue, please make sure it is up to date and if so, add a comment that this is still an issue to keep it open. Thank you for your contributions.

[MrShakila]

@Nickkorol Did you fixed it?