Throwing error when the configs fail JSON serialization

Sources/Hub/Hub.swift

@@ -10,13 +10,28 @@ import Foundation
 public struct Hub {}
 
 public extension Hub {
-    enum HubClientError: Error {
+    enum HubClientError: LocalizedError {
         case parse
+        case jsonSerialization(fileURL: URL, message: String)
         case authorizationRequired
         case unexpectedError
         case httpStatusCode(Int)
+
+        public var errorDescription: String? {
+            switch self {
+            case .parse:
+                return NSLocalizedString("Failed to parse the configuration.", comment: "Parse Error")
+            case .jsonSerialization(_, let message):
+                return message
+            case .authorizationRequired:
+                return NSLocalizedString("Authorization is required.", comment: "Authorization Error")
+            case .unexpectedError:
+                return NSLocalizedString("An unexpected error occurred.", comment: "Unexpected Error")
+            case .httpStatusCode(let statusCode):
+                return String(format: NSLocalizedString("HTTP error with status code: %d", comment: "HTTP Status Code Error"), statusCode)
+            }
+        }
     }
-
     enum RepoType: String {
         case models
         case datasets

Sources/Hub/HubApi.swift

@@ -106,9 +106,13 @@ public extension HubApi {
     /// `fileURL` is a complete local file path for the given model
     func configuration(fileURL: URL) throws -> Config {
         let data = try Data(contentsOf: fileURL)
-        let parsed = try JSONSerialization.jsonObject(with: data, options: [])
-        guard let dictionary = parsed as? [NSString: Any] else { throw Hub.HubClientError.parse }
-        return Config(dictionary)
+        do {
+            let parsed = try JSONSerialization.jsonObject(with: data, options: [])
+            guard let dictionary = parsed as? [NSString: Any] else { throw Hub.HubClientError.parse }
+            return Config(dictionary)
+        } catch {
+            throw Hub.HubClientError.jsonSerialization(fileURL: fileURL, message: "JSON Serialization failed for \(fileURL). Please verify that you have set the HUGGING_FACE_HUB_TOKEN environment variable.")
+        }
     }
 }