im now in lesson 26 and again it says “externally managed environment” and thats because you have not tested the system, and i still havent heard anything about the problems in lesson 25. You have realised the material to early.
The LCD1602 module is also working properly when you follow the steps in video lesson 26. We reproduced the test and worked well. Video 26: Using an LCD1602 LCD Display with I2C — SunFounder Ulimate Raphael Kit for Raspberry Pi documentation
If you encounter errors, please share the screenshot with us, so that we can analyze and solve the problem.