该错误通常是由于在AFHTTPSessionManager和AFURLSessionManager实例之间混合使用共享NSURLSessionConfiguration引起的。解决方法是在进行SSL证书锁定时创建新的AFURLSessionManager实例，并使用一个自定义的NSURLSessionConfiguration而不是共享的一个。

以下是示例代码：

let pinnedCertificates: [SecCertificate] = ...
    
let serverTrustPolicy = ServerTrustPolicy.pinCertificates(
    certificates: pinnedCertificates,
    validateCertificateChain: true,
    validateHost: true
)
    
let serverTrustPolicies = [
    "example.com": serverTrustPolicy
]
let sessionManager = Session(
    configuration: URLSessionConfiguration.af.default,
    serverTrustManager: ServerTrustManager(policies: serverTrustPolicies)
)
    
sessionManager.request("https://example.com/api/path").responseJSON { response in
    // Handle response
}