Costi,
I'm not sure what the error means, but I'd start with restarting the software!
I can tell you what my SX100 LaB6/CeB6 (currently) settings are like, if that helps:
When new (March 11 2015) my Iemi was 57 at 15 keV. Set by using the Gun High/Low images. The initial value presumably depends on the tip distance from the cap (3/4 turn, perhaps?).
Over time the value increases:
![](https://probesoftware.com/smf/proxy.php?request=http%3A%2F%2Fi63.tinypic.com%2F2exvhxk.jpg&hash=333568e9f0a476fab1c09e35a085201b9e0bb945)
Once i have a value usually have a routine of:
1) Setting C1=C2=1200.
2)Run Gun Auto.
3)Tweak Iemi to get the highest faraday cup current at C1=C2=1200.
4)repeat 2 and 3 until values are not changing (typically 2 iterations).
I never turn down the Heat if I can avoid it. When not using the instrument I usually only turn off the accelerating voltage to prevent the regulation aperture from getting contaminated, or I leave it with low probe current.
Gareth