Programs usually manage their own errors displaying informations with alerts and error messages. When an unexpected error happens and the operative system don't know how to go on, a system error message is shown. Usually, after that, the program who caused the problem is stopped. Windows has a memory management systems that prevents programs to access other programs' memory space. If a program try to access a forbidden memory cell, an exception is thrown. Some other operations can throw exceptions, like a division by zero, for example.
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What does download error code 492 mean
Percentage error shows how wrong an answer can be with respect to the value of the answer itself. So, we can see how serious the errors are. For example, lets say we have an answer whose mean error is 40. If nothing is given of the actual value of the answer, we cannot determine if this error is insignificant or very serious. If the actual answer was 40000, this mean error of 40 is quite insignificant as the percentage error is 40/40000 x 100 = 0.1 % 0.1 % error is quite insignificant. Mean error, on the other hand, does not help us to determine the significance of this error in any way.
yes
used for internal consistency or error estimation
The mean absolute percent prediction error (MAPE), .The summation ignores observations where yt = 0.