1. There is a visual bug where I cant see the trees growing.
   
2. I tried to use the /bonsai maker but it gave me an error.
   
   Log :
   bonsai-latest.log

I don't fully understand when that error is happening.
You've successfully created the json files? But when you try to load them up they don't work? Can you please attach them here, so I can see what's wrong with them?

bonsai-exports.zip

this is the files that I got

The tree models are garbled. Did you make sure the preview looked ok and showed only the tree?
You have to isolate the tree you want to turn into a bonsai completely. No blocks may touch the tree directly or diagonally.

How can I create a preview? do I have to do it in creative?

this is the preview that I see when I start /bonsai maker

This is the preview that I'm talking about. It should only show the tree.
Again, you have to make sure the tree is touching nothing.

Thank You for your assistance. I love this mod and the /bonsai maker that was added. Everything is working now and thank you for being active with quick response.

You are welcome! I'm working on improving the Bonsai Maker a bit more so others don't run into the issues you did! Thanks for the report!

Please update to the latest version and retest.

Unfortunately the second problem still isn't fixed. The mod that im trying to add is Ferroustry