Harmony HMI "Your computer is low on memory" Error

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From the Task Manager, check the memory usage of each application. If there is an application with an excessive usage, try to close it.

Also, it is possible to set up Virtual memory as well.

Go to Control Panel->View advanced system settings (you can just type it from the Start bar).

Then in the System Properties dialog, go to the Advanced Tab.
Under Performance, click on the Settings… button.
In Performance Options dialog, go to the Advanced Tab.
Under Virtual Memory, click on the Change… button.
In the Virtual Memory dialog, untick the “Automatically manage paging file size for all drives” checkbox if it is ticked.
Select C:\ from the list.
Select “Custom size”.
Assign 4GB (4096MB)
Click OK.