Failed to fetch API

[mariaptk]

While requesting

https://iis.bsuir.by/api/v1/schedule?studentGroup=410902

Received following error

dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "The given data was not valid JSON.", underlyingError: Optional(Error Domain=NSCocoaErrorDomain Code=3840 "Unexpected character '<' around line 1, column 1." UserInfo={NSDebugDescription=Unexpected character '<' around line 1, column 1., NSJSONSerializationErrorIndex=0})))

Context

Version: 3.5.2(130)