It says it requires jankson 2.0 but i can only find up to Jankson-1.0.0+j1.1.2.jar. do you know where this can be found.

Its working now I was stupid. I had looked at the dependencies listed on curseforge for it and downloaded latest jankson I could find. Running it without the downloaded jankson and it works fine.
Thankyou though for the quick response, I only tried it by itself after the file you gave me didn't work either and your explanation. apologies on my part. TY very much.

Jankson 2.0 should be included inside the Shulker Charm jar itself. If it's not working, you can download Jankson here.