ios facebook login sdk 4.28.0 error code 3

Question

Error Domain=com.facebook.sdk.core Code=3 "(null)" UserInfo={com.facebook.sdk:FBSDKErrorDeveloperMessageKey=Unknown error building URL.}

The login code is as follows

FBSDKLoginManager *login = [[FBSDKLoginManager alloc] init];

    [login
     logInWithReadPermissions: @[@"public_profile"]
     fromViewController:self
     handler:^(FBSDKLoginManagerLoginResult *result, NSError *error) {
         NSLog(@"facebook login result.grantedPermissions = %@,error = %@",result.grantedPermissions,error);
         if (error) {
             NSLog(@"Process error");
         } else if (result.isCancelled) {
             NSLog(@"Cancelled");
         } else {
             NSLog(@"Logged in");
         }
     }];

Answer 1

Encountered the same error today, after upgrading to version 4.39.0. Downgrading to 4.38.0 resolved it.