Error link1168

[Zivojin]

Hello everyone.My program was working but suddenly after i just changed some numbers it started to fail with error link1168
This window pops out

  _CRT_SECURITYCRITICAL_ATTRIBUTE
void __CRTDECL operator delete(void* const block) noexcept
{
    #ifdef _DEBUG
    _free_dbg(block, _UNKNOWN_BLOCK);// Exception thrown at 0x0F89D9CB (ucrtbased.dll) in Projekat4.exe: 0xC0000005: Access violation reading location 0xDDDDDDCD.
r
    #else
    free(block);
    #endif
}

Where can the error possibly be?
This is main

#include<iostream>
#include"Workflow.h"
#include"Activity.h"
#include"State.h"
void main()
{
	

	srand(time(NULL));
	
	Step **n=new Step*[1009];
	Step **k = new Step*[1009];
	Workflow *W1 = new Workflow(20);
	W1->Definisi("Activity", 10);
	W1->Definisi("State", 10);
	n = W1->GetSpecificSteps("Activity");
	k = W1->GetSpecificSteps("State");
	W1->InsertAt(12,"Activity");
	W1->RemoveAt(18);
	
	
	Workflow *W3 = new Workflow(1009);
	Workflow *W4 = new Workflow(1000);
	Workflow *W2 = W4;
	cout << *W1;

	delete[]n;
	delete[]k;
  delete W1; //dolazi do neke greske u programu 
delete W3;
delete W4;
delete W2;
	system("pause");
	}

[Repeater]

Read the error:
cannot open filename.exe for writing

Read it again:
cannot open filename.exe for writing

Do you understand what this says?

I expect that you're still running the executable. You have to close it before you can write over it. Other possible problems include not having permission to write to disk, and disk errors.

This is not a problem with your source code. You need to actually READ the error messages.

[Zivojin]

I have closed all my windows with visual studio and executable windows but still doesn't work.I don't think I had this message earlier.

[Repeater]

That's what errorLNK1168 means:

https://docs.microsoft.com/en-us/cpp/error-messages/tool-errors/linker-tools-error-lnk1168

[Handy Andy]

Hello Zivojin,

Your error is about not being able to write to the file. But where is the code that opens the file and writes to it?

Your problem may start in "main", but that is not likely where it is.

Post the code that opens the file and where it writes to the file.

Hope that helps,

Andy