Develop Reference

Error "Object reference not set to an instance of an object." for CreateUserWithEmailAndPasswordAsync

I get error for code work before in Xamarin Android using Visual Studio 16.2.5:
I try to search new requirements for my may be outdated code
In main Activity
FirebaseApp.InitializeApp(Application.Context);
In function a call
var res = await FirebaseAuth.Instance.CreateUserWithEmailAndPasswordAsync(email, password);
I get exception Object reference not set to an instance of an object.

I do downgrade to version 60.1142.1 to fast fix problem

Why QBFC is throwing exception with message "String too long" instead of response containing error code?

I have a C# program that is using QBFCv13 to create 46 customers in QuickBooks Pro 2014.
When the program runs, I get an exception with message "String too long.". I am guessing it's probably caused by one of the customer name is too long so I test the program to create 2 customers with one long name. This time I didn't get an exception. I get a response list with one response containing error code and the other response without error.
I am confused. Why in certain case I get an exception? The message doesn't contain any more message than "String too long". I am wondering if there is something else I can do to figure what is causing this "String too long" error.
Thanks.

Try enabling verbose logging and see if it tells you what the error is.
https://intuitpartnerplatform.lc.intuit.com/questions/177198-troubleshooting-sdk-issues

Reading and writing registry returns error

Well, I'm trying to write/read a SubKey on my application, but it give me a error.
Registry.LocalMachine.OpenSubKey("Software\\SAMP", true).SetValue("PlayerName", textBox1.Text);
string gamePath = Registry.LocalMachine.OpenSubKey("Software\\SAMP").GetValue("gta_sa_exe").ToString();
The error is on the first line:
"Object reference not set to an instance of an object."
Sorry, but I am pretty newbie on C# and just can't figure it out.

you try to get non existing key.
you should create the key before you try to get it.
here is a sample code
Registry.LocalMachine.CreateSubKey("Software\\SAMP");
Registry.LocalMachine.OpenSubKey("Software\\SAMP", true).SetValue("PlayerName", "tremp");
string gamePath = Registry.LocalMachine.OpenSubKey("Software\\SAMP").GetValue("PlayerName").ToString();

Using an HTML Link

I have a C# ASP.NET application that throws an "Object reference not set to an instance of an object" exception.
The line that throws the exception is
HtmlLink cssTemplate = new HtmlLink();
I am using the cssTemplate variable in my site to set the CSS sheet on my masterpage based on the logged in user.
Any ideas as to why I would get this error on instantiation of the cssTemplate object?
Update: The entire snippet from the exception is
Message: Object reference not set to an instance of an object.
Stack Trace: at LRMasterPage.Page_Load(Object sender, EventArgs e in
LRMasterPage.master.cs:line 49
Target Site: Void Page_Load(System.Object, System.EventArgs)
Data: System.Collections.ListDictionaryInternal
I am wondering now if it is the System.Collections.ListDictionaryInternal that might actually be the issue.

Is there any way to go to all links in page in watin i have used the following code but no use

couple of days back i have used the same code to go to each and every page, today it doesn't work. Does anyone know an other approach than this:
var browser = new IE("http//www.xyz.com");
foreach (Link l in browser.Links)
{
Console.WriteLine(l.Url);
if (l.Url.IndexOf("javascript") == -1)
{
browser.GoTo(l.Url);
browser.WaitForComplete();
Thread.Sleep(200);
browser = IE.AttachTo<IE>(Find.ByUrl(browser.Url));
browser.Back();
}
}
error Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object.

A NullReferenceException means that you are trying to call a method or access a field/property of a null object. You need to step through this code and figure out what is null when it shouldn't be using the debugger.