Error Gravity: 2-Channel I2C DAC Module (0-10V)

Hello,
I would like to use the Gravity: 2-Channel I2C DAC Module (0-10V)(https://www.dfrobot.com/product-2613.html) to control a fan.
It is connected to an ESP32 Relay Board and should be controlled via Home Assistant using I2C.

The fan is a Systemair (https://shopng.systemair.com/upload/assets/WIRING_PRIO_EC_20201002_080052049.JPG?aa0cdd3b)

Unfortunately I always get the following error message (see screenshot)

I have tested it on 3V and on 5V.

Can anyone possibly help?

Here is a snippet of the YAML:

<div class="box">

# Output via 2-channel I2C DAC module (0-10V)

gp8403:

id: out10v

voltage: 10V

i2c_id: bus_a

output:

- platform: gp8403

id: out10v_1

gp8403_id: out10v

channel: 0

- platform: gp8403

id: out10v_2

gp8403_id: out10v

channel: 1

#Exhaust PWM OUT

- platform: ledc

id: exhaust_pwm

pin: GPIO4

# Set MIN and MAX for exhaust PWM fans here!

min_power: 20%

max_power: 100%

zero_means_zero: false

</div>