Require prawn not working

hello everyone,
i have installed the ruby gem prawn and mysql, but when i use require it doesn’t work and it gives those errors.
i’m using prawn 2.1.0 and sketchup 2016 64 bit.
i tried to add full path to the ruby gems but nothing. how can solve this problem ?

@DanRathbun do you have any idea how to solve this error ? and why does it give such error even if i tried to give the full path to where the gems are installed ? i’m stuck in this error for the past 2 days and i can’t seem to solve it, if u can help it’ll be great