Object Reference not set to an instance of an object
Anonymous User12-09-2019 15:33
Vivek Goel12-10-2019 03:30
Rohan Shankar07-31-2020 13:48
evan chirger12-22-2020 05:52Best Answer
Piotr Wieczerzak04-05-2022 09:27
1. Object Reference not set to an instance of an object
The code stage has no errors compiled, while running it fires this error ==>Object Reference not set to an instance of an object
Why is not saying which is the error??
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Cohen
RPA DeveloperRomania
------------------------------2. RE: Object Reference not set to an instance of an object
Object Reference related errors are run time errors not compiler errors. These errors normally come when you try to refer to a data item/variable which is null (Null Reference exception) or else if you are trying to refer to a variable which is not yet initialized. .
Can you please post your code so that we can guide you further?
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Vivek Goel
RPA Architect
Asia/Singapore
+6594554364
//www.rpatools.com/
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------------------------------3. RE: Object Reference not set to an instance of an object
Hi Vivek,
Could you guide me through my code related to the same issue:
Page page = System.Web.HttpContext.Current.Handler as Page;
str = "page doesn't exist";
if (page != null)
{ str = "page exists!!";
}
There is the same runtime exception - object reference not set. I have the dll and reference mentioned in the Init page though.Along with the above if you could additionally help me with the below:
I am trying to run this code through code stage in BP to call a java script function "JSFUNCTION" - the JS function already exists in the webpage.
System.Web.UI.Page page = new System.Web.UI.Page();
ClientScriptManager cs = page.ClientScript;
cs.RegisterStartupScript(page.GetType(), "Javascript", "JSFUNCTION(false,this);", true);The run is successful but nothing happens on the page, the function works when called from Console (dev tool in browser).
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Rohan Shankar
Analyst
Ericsson
Asia/Kolkata
------------------------------4. RE: Object Reference not set to an instance of an object
Best Answer
An Object is an instance of a Class , it is stored some where in memory. A reference is what is used to describe the pointer to the memory location where the Object resides. The message "object reference not set to an instance of an object" means that you are referring to an object the does not exist or was deleted or cleaned up. It's usually better to avoid a NullReferenceException than to handle it after it occurs. To prevent the error, objects that could be null should be tested for null before being used.
if (mClass != null)
{
// Go ahead and use mClass
mClass.property = ...
}
else
{
// Attempting to use mClass here will result in NullReferenceException
}------------------------------
evan chirger
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5. RE: Object Reference not set to an instance of an object
Hi,
I had similar issue. And problem appeared because bot user used to login to Windows, had temp windows profile.
Once I used other user at this VDI with normal profile, and also return bot user to use normal profile, issue disappeared.
Best Regards
Piotr Wieczerzak------------------------------
Piotr Wieczerzak
Senior developer and analyst
Brown Brothers Harriman
Europe/Warsaw
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