Question: How can I fix plot for system of Differential equation in RKF45 method.

Please check this code and fix the error. And help me with the below two questions.

1- In the above image, I'm getting the error when I'm to plot my solutions.

2- How to get information from this system?

      The values of x_1 and corresponding y_1 and so on and errors etc

This is a downloadable link to my worksheet []


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