Hello Brajamohan panda,
Runtime error is nothing but a bug that occurs either during the installation process or when the program is running in a live system execution environment.
It's because of low memory in RAM,or Process may be blocked in the processor.so that Running program needs the memory resources and system resources.
But These Resources are not available or blocked means the Run time error occurs.
When you next time Run these program,it would run normally.or you may need to Restart the system for proper system resources.
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