OSError: [Errno 12] Cannot allocate memory:

This error occurs when a program tries to allocate more memory space than is available in the system. It can happen when a process is trying to use too much memory or when the system itself is running low on memory due to too many processes running at the same time.

To fix this error, you can try the following solutions:

1. Close any unnecessary programs or processes running on your system to free up memory.
2. Increase the swap space of your system. This can be done by creating a swap file or resizing the existing swap partition.
3. Upgrade your system's RAM to increase the available memory.
4. Modify the program's memory usage by optimizing the code or reducing the amount of memory it tries to allocate.

It is important to note that this error can also be a symptom of a more serious problem, such as a memory leak or hardware failure. If the error persists after trying the above solutions, it may be necessary to seek further assistance from a professional.