human error.........
Experimentation
Rabbits, as well as Rats, and Mice are the most common animal experimentation victims.
chemical
Pilot error.
myopia
Variance, standard deviation and standard error are the most common but there are also mean absolute error, standardised error range inter-quartile range The use of "error" does not mean that anything is wrong - the expression simply means difference from the expected value.
One of the most common reasons for getting a server application unavailable error is mixing dot NET framework. The error usually shows up when the Application Pool does not start.
the most common cause of an outlier is an error in the recording of data.
Turning without signal
The most common causes are human error and faulty equipment.
This is error display system , when you modem is not install or configure properly
Incorrect placement or number of parentheses will probably make the most common syntax error in LISP programs.