Most likely due to the reason described here: SAVE_CONFIG section 'bltouch' option 'z_offset' conflicts with included value
In short: If you have something like:
[I'm an included settings block]
I'm_a_SAVE_CONFIG_setting: value
then you will run into this error. The solution is to move the entire block [I'm an included settings block] back to printer.cfg as Klipper does not support modifying included settings.
Since you are including the E5P.cfg then this is true at least for:
[extruder][heater_bed][bltouch]