TypeError: $(…).modal is not a function
The $(…).modal is not a function is usually caused because scripts are loaded in the wrong order . The browser will execute the scripts in the order it finds them. If in a script you attempt to access an element that hasn't been reached yet then you will get an error. Make sure that you don't have a script above one that it requires.
Bootstrap : TypeError
For example, bootstrap depends on jQuery , so jQuery must be referenced first. So, you must called the jquery.min.js and then bootstrap.min.js like the following:
<script src="/jquery-3.3.1.min.js"></script>
<script src="/bootstrap.min.js"></script>
bootstrap.js

Plugin dependencies
Some plugins and CSS components depend on other plugins. If you include plugins individually, make sure to check for these dependencies in the docs. Also note that all plugins depend on jQuery (this means jQuery must be included before the plugin files).Multiple jQuery instances

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