Error

In the synchronous mode this field holds the result of the last function.In the asynchronous mode this field has actual value only for functions executed synchronously. For functions that can be executed asynchronously the result is always set to ERR_OK. To get a result of asynchronous functions you must use events. The OnError event is fired in both modes. And its up to developer do define what style of error detection to choose - OnError or examining the Error property. If you do not use the asynchronous feature it is better to check Error property after each function.

Here you can find all possible values of Error and their short meaning.