How to solve the problem that the object reference is not set to the instance of the object when sav

Workbench has errors like "Missing root element".

Error: When starting Workbench, it says "Object reference is not set to the instance of the object (Chinese)" with details in English. :

The object reference is not set to the instance of the object. The object reference is not set to the instance of the object. Workbench appears:

Missing root element waiting.

Reason: It may be caused by illegal operations, and the specific reason is not clear!

Workaround: 1) XP system: find directory c:

documents and settings\..Application Data Ansys v190 (Ansys version number) Delete all files in the folder and restart WB.

2) Win7 or above, system: C: User administor appdata roaming ansys delete, restart workbench!

Problems encountered:

After installing Ncode DesignLife, Ansys Workbench starts up normally, Geometry and Mesh can be used, but Mechanical Model and many analysis projects cannot be opened...

Solution: Reminds me of ncode designlife's *There is a prompt in the NFO that you need to modify a certain file to verify the first line of information. Actually,I've modified it before.,Open it with ultraedit and see.。。。

Sure enough: there is no problem with the first line, there is a problem with the 114th line, the format has been tampered with to for, at, quickly modify it correctly, restart workbench, try each module, everything is normal

The above is a little of my insights, written out for everyone's reference

The location of the file and the corrected contents are as follows:

1) The opening parenthesis is missing from the first line;

2) On line 114, the format has been tampered with to for, at

File Location: First line:

Line 114.

Do you use the Chinese version of Ansys?

If not, can you tell us about the error message in English? That might be a little clearer!

All of them tell you that the object is not instantiated.

What are the specific analyses you want to save?

1. First click to open the "Run" option in the start menu bar in the lower left corner of the computer desktop.

2. Then in the running interface that appears, click on the input box, type the command", and press the Enter key.

3. Then in the service interface that appears, find the service Security Cente.

4. After finding this service, double-click to open it, click "Startup Type", select the "Automatic" setting option, and select Apply.

5. Then choose to start the service, and after the startup is complete, click on the "OK" option, so that you can solve the problem

The error in that sentence is not necessarily wrong, and the place is over there.

The landlord should be doing the windows form should be a program.

Web applications don't have a DataGridView control.

I just used the landlord's ** debugging and found no errors.

The first thing to do to find the error is to understand what it means to not set the object reference to the instance of the object.

newsqlconnection(con)

newsqldataadapter(sql,connection)，new

dataset() are called instances of the object.

And sqlconnection

Connection, sqldataadapter

adapter, dataset in adapter

The sets in the set are called object references.

The whole sentence does not set the object reference to the instance of the object, which means that the instance of the object is assigned to the object reference as null, which is equivalent to the default value of the object reference.

Originally, when we declared an object reference, the default value was null

For example, let's declare a dataset

set;If you don't give it =new

dataset() is just like that

set;It defaults to null (empty).

To put it bluntly, this sentence is to say your new

sqlconnection(con) or.

The instance of newsqldataadapter(sql,connection) does not exist at all and is empty.

Object references never seem to be useful, referencing you as an object instance, or my default value is empty (it says it's set to a bit abstract, because the translators speak very abstractly).

So the problem of the landlord looking at the tables in the database by himself was solved.

**No problem, just you're new

sqlconnection(con) or.

NewsqlDataAdapter(SQL,Connection) is empty.

The database name in the con statement may be incorrect.

Alternatively, the people table name in the SQL statement does not exist.

appeared"The object reference is not set to the instance of the object. "It's because you called a method or property in it with a null reference (not pointing to any object).

Here it is undoubtedly session["Name"], you can go to the step-by-step to trace this sentence and look at session["Name"] is null, if I'm not mistaken, it should be null. That way you're going to have to give session[.]"Name"] assigned.

Typical null pointer exception.

It is advisable not to write such long sentences.

Fault tolerance is too poor.

May be empty. coursenametextbox"It's also possible to be null if you call an empty object's method.

As. findControl() and ToString() will result in the error "Object reference is not set to an instance of the object".

So I recommend using more if conditional statements.

Determines whether the object is empty.

Do it again.

That is, the object reference is empty.

Such as formmyform;

The object reference is not set to the instance of the object.

And the right thing is.

formmyform;

myform=new

form();Create a new instance and set an object reference to the instance; That's right.

If the object settings are not referenced to the instance of the object, it is basically not initialized or not instantiated, which should be myda"jy

.rows(0).item("Library card number"There's a problem with the value here, you can use the variable to set a breakpoint.

Hello: session[.]"Name"] for the void you. tostring(), "Object not referenced to instance error".

Hope it helps!

You want to interrupt the point of debugging, and the details depend on **Cai knows. This error usually occurs when you want to use an object, but an object is not initialized and is null, for example, object a, a is null. This prompt will appear when you call a method in the A object.

Now"Not like the reference is set like the instance"Call it or a property with a null reference (not pointing to anything).

Suspicious session[.]"Name"] question, step through the sentence, take a look at session["Name"] value is not empty, I guessed correctly that it should be empty. To be preceded by the session[.]"Name"] assignment.

"Object reference is not set to an object instance" generally means that the object is not instantiated, or that the object = nullUsually, the array is more than defined, or the array is empty, and the value is used.

Break point: Step through which class name is misspelled or an object is not instantiated.

This way of judging null is not good, I remember that there is a requiredfieldvalidator control that can directly determine whether to enter and set the prompt, which can be done directly when designing the page.

In addition, the session needs to be passed before it can be used, and if it is not passed or defined first, an error will be reported. So don't test alone.

That's right, the meaning of this error is: an object, you didn't instantiate it, but you called it in the program, it's wrong, so you throw an exception.

In your **, it is clear that the nickname object is not instantiated.

You can step through the interrupt point yourself to see if there is a value for nickname. If not, how do you display it?

It means that you didn't find the courseNameTextbox, or you didn't get the courseNameTextBox when you got the value in it, you can debug it and then monitor it to see how FindControl can get this control.

It's a null reference, and that's the problem.

It wasn't found. label1 control, do you confirm that there is a control with ID label1 on the next page!! That's it!

It may also be that the string is repeatedly named, which will also lead to an error like string str = ;

"md5");

After encryption:"+ str "] error ah corrected:

After encryption:" +

You are getting a local file, and the error is because the local file was not found, and you check if the path is correct, or if the file really exists.

Typically, "the object reference is not set to an instance of the object" means that either the object is not instantiated and is used, or it is empty.

This error obviously has nothing to do with yours or the operating system. It's a problem with software A.

A null pointer exception occurs in software A, which simply means that the software accesses nothing in the memory, but it wants to take something out of it.

If it's custom software, ask the developer to check the classes and functions mentioned in the message to find bugs in the program.

If not, then throw away software A.

According to what you said, if another system or an old system is working, then there is another possibility that your system is missing the necessary DDL files.

In this way, you can only reinstall the system, and don't use the ghost version.

PS: 360 consistently garbage.

Find a variable and look at request["goodsid"I don't know what exactly it is.

You didn't pass the value over, that's why you reported an empty pointer abnormality.

I'll have to look at your program for this, it's hard to say what's going on.