I2C error (Please check if the I2C device insert in I2C of Base Hat)

[fragkrag]

Describe the bug
Error running demo provided by Seed SI1145 documentation for use with Raspberry Pi - using Raspberry Pi 4B, Seeed SI1145, with a Grove adapter board

To Reproduce
Steps to reproduce the behavior:

1. Followed instructions to install Seeed library
2. ls/dev/i2c* returns /dev/i2c-1, /dev/i2c-20, /dev/i2c-21
3. Run https://wiki.seeedstudio.com/Grove-Sunlight_Sensor/#si1145---play-with-raspberry-pi script
4. Receive OSError("Please check if the I2C device insert in I2C of Base Hat"). Previous error is in WriteByte(SI114X-REG.COMMAND, SI114X_CMD.RESET)
   Expected behavior
   Get UV, Visible, IR light data

Desktop (please complete the following information):

• OS: Raspberry Pi OS

Additional context
Have also tried communicating to the sensor using the 115X library - no error there but the data from the sensor does not seem to change based on the light.