Unable to display actual code block content

Hi,

I’m using this plugin to display code blocks in my blog post.
My post already contains the code blocks with

 tags but when I used this plugin it is not displaying the content .
For example in my text view I have the content like this. It should display only the "Testing code" text. but it is displaying whole data like "<span style="color: yellow;">Testing code</span>"
ex: <span style="color: yellow;">Testing code</span>

<span style="color: green;">Testing pre tag</span>

.

Please provide me a solution how to fix this issue using this plugin.