NEED I2C help

Hi!
I am a beginner in using arduino. I am working on a project : Communication between two arduino boards using I2C, but I have a problem. The lcd display doesn’t display anything. I am sorry for replying here but I couldn’t find where to post my question.

The project that I am working on is described below:

I tried the simulation with the hardware connections given in the link above, but nothing appears in the lcd display. The code compiles, but I am not sure if it is correct.

Can anyone help me please find out the problem? How can I make this project work correctly?

I would really appreciate your help.

Thank you!

Cross post.