The word error has a broad range of meanings in our daily lives and a specific connotation in science. In too many cases, the word is misinterpreted to mean the natural uncertainty in experimental measurements.
Physics begins with measurement.
Every measurement has a degree of uncertainty associated with it. Such deviations are called systematic. Therefore, any set of measurements exhibits a spread or range of values. These deviations are called random. We will seldom deal with systematic uncertainties.