Reading data from power supply

Hi all
I'm trying to write and read data from two power supplies(Agilent 6643A and N6705B) but I get error as shown in the attached screenshot.

Wishing the best
Sattam
_sk
There is no error in the shown image.

Errors appear in the debugger in this way (attached, underscored with red).

best,
_sk
error.png (43.87 KB)