Uncaught TypeError: $(…).accordion is not a function

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Hi I am having an error, Uncaught TypeError: $(…).accordion is not a function.

Could be being caused by jquery version, not entirely sure. Other errors I am getting are

jquery-migrate.min.js:2 Uncaught TypeError: Cannot read property ‘migrateMute’ of undefined

selectize.min.js:2 Uncaught TypeError: Cannot read property ‘extend’ of undefined