The CSS script displays this message when the user has turned on the recording of signals before starting the engine, while according to the instructions, the recording should be started while the engine under test is idling.
In this case, it is not necessary to repeat the test. It is enough to select a portion of the signals before starting the script, which then will start from the section corresponding to the engine idling. In this case, the script will analyze only the selected area. To do this, call the menu "Display => Switch to oscillograms view" - you will see the signals recorded at the very beginning of the test. And since the engine was not working at that moment, you will see horizontal lines instead of the expected signals. Now, for better clarity, set the value of the parameter "Horizontal Scale" equal to "1: 400" or "1: 500".
Using the horizontal scroll arrow, find the recording area where the crankshaft sensor pulses appear - this is the moment when the engine is started. Move a few more seconds later to the area where the pulse repetition rate of the crankshaft sensor becomes constant - this is the engine idling. From this point, you should begin to select a portion of the signals. To do this, move the mouse pointer to the waveform display area, press the left mouse button and without releasing it, move the pointer to the extreme right edge of the screen - after that, the window will start to scroll. Keep the left mouse button pressed until you see the recording area on the screen where the signals disappear. Now release the left mouse button and start signal analysis again.