Plot in a measrue statement

I am simulating a circuit with a stepped parameter. I need to draw the rms of a current for each step within a window of time.
I am using the following statement, but apparently it is not wrong.
The help is not very clear to me on how to implement this.

.meas plot IL1_RMS RMS I(L1) from=100m to=240m

This is how to use .meas plot
For next simulation, you must firstly close .meas.qraw waveform viewer window to re-enable Run button.

Thanks so much, this was helpful.