Question

How does error differ from an uncertainty

Answer 1

$Error$ is defined as a difference between the desired and actual performance or behavior of a system or object. This definition is the basis of operation for many types of control systems, in which error is defined as the difference between a set point and the process value.

$Uncertainty$ is a central concept quantifying the dispersion one may reasonably attribute to a measurement result. Such an uncertainty can also be referred to as a measurement error.

In summary, $Error$ is the difference between a measurement result and the value of the measured while $Uncertainty$ describes the reliability of the assertion that the stated measurement result represents the value of the measured.