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Here's how to Fix Assertion failed IsValid() SharedPointer.h [Line 840].

i. The error message "assertion failed _crtisvalidheappointer(block)" means that the CRT (C Runtime Library) has detected that a pointer is not pointing to a valid block of heap memory. This can happen for a variety of reasons, such as:

* The pointer has been overwritten.
* The pointer has been freed.
* The pointer is pointing to a block of memory that has been allocated by a different thread.

To fix this error, you will need to identify the specific reason why the pointer is not pointing to a valid block of heap memory. Once you have identified the reason, you can take steps to fix the problem. For example, if the pointer has been overwritten, you can restore the pointer to its original value. If the pointer has been freed, you can allocate a new block of heap memory and assign the pointer to the new block. If the pointer is pointing to a block of memory that has been allocated by a different thread, you can use the `InterlockedCompareExchange` function to ensure that the pointer is only pointing to a block of memory that has been allocated by the current thread.

Here are some additional troubleshooting tips:

* Use a debugger to step through the code and identify the line of code that is causing the error.
* Use a memory profiler to identify the memory blocks that are being used by the application.
* Use a heap verifier to verify that the heap is being used correctly.

If you are still having problems with the error, you can contact the developer of the application for assistance.

ii. The error message "assertion px = 0' failed" means that the assertion `px != 0` has failed. This assertion is typically used to check if a pointer is pointing to a valid object. If the pointer is not pointing to a valid object, the assertion will fail and the program will crash.

There are a few reasons why the assertion `px != 0` might fail. One possibility is that the pointer has been overwritten. Another possibility is that the pointer has been freed. Finally, it is also possible that the pointer is pointing to a block of memory that has not been allocated yet.

To fix this error, you will need to identify the specific reason why the assertion has failed. Once you have identified the reason, you can take steps to fix the problem. For example, if the pointer has been overwritten, you can restore the pointer to its original value. If the pointer has been freed, you can allocate a new block of heap memory and assign the pointer to the new block. If the pointer is pointing to a block of memory that has not been allocated yet, you can allocate a new block of heap memory and assign the pointer to the new block.

Here are some additional troubleshooting tips:

* Use a debugger to step through the code and identify the line of code that is causing the error.
* Use a memory profiler to identify the memory blocks that are being used by the application.
* Use a heap verifier to verify that the heap is being used correctly.

If you are still having problems with the error, you can contact the developer of the application for assistance.

iii. The error message "assertion failed isingamethread()" means that the assertion `IsInGameThread()` has failed. This assertion is typically used to check if the current thread is the game thread. If the current thread is not the game thread, the assertion will fail and the program will crash.

There are a few reasons why the assertion `IsInGameThread()` might fail. One possibility is that the code is being executed on a thread that is not the game thread. Another possibility is that the code is being executed on the game thread, but the game thread has not yet been initialized. Finally, it is also possible that the code is being executed on the game thread, but the game thread has been terminated.

To fix this error, you will need to identify the specific reason why the assertion has failed. Once you have identified the reason, you can take steps to fix the problem. For example, if the code is being executed on a thread that is not the game thread, you can move the code to the game thread. If the code is being executed on the game thread, but the game thread has not yet been initialized, you can initialize the game thread before executing the code. If the code is being executed on the game thread, but the game thread has been terminated, you can restart the game thread.

Here are some additional troubleshooting tips:

* Use a debugger to step through the code and identify the line of code that is causing the error.
* Use a memory profiler to identify the memory blocks that are being used by the application.
* Use a heap verifier to verify that the heap is being used correctly.

If you are still having problems with the error, you can contact the developer of the application for assistance.

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