'Why Mapbox Navigation Map is showing black in iOS app?

I am using Mapbox Navigation SDK for iOS in my app but it is showing black. I have no idea why it is happening so. Can anybody give any idea please?

Map doc ref: https://docs.mapbox.com/ios/navigation/api/1.0.0-alpha.1/

issue: enter image description here



Solution 1:[1]

there was a problem of version in Direction API

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Abhayjeet Singh