How to solve loading module script?

I get this error:

Failed to load module script: The server responded with a non-JavaScript MIME type of "". Strict MIME type checking is enforced for module scripts per HTML spec.
polyfills-es2015.js:1 

Failed to load module script: The server responded with a non-JavaScript MIME type of "". Strict MIME type checking is enforced for module scripts per HTML spec.

main-es2015.js:1 Failed to load module script: The server responded with a non-JavaScript MIME type of "". Strict MIME type checking is enforced for module scripts per HTML spec.

HTML file with scripts:

<script src="runtime-es2015.js" type="module"></script><script src="runtime-es5.js" nomodule defer></script><script src="polyfills-es5.js" nomodule defer></script><script src="polyfills-es2015.js" type="module"></script><script src="scripts.js" defer></script><script src="main-es2015.js" type="module"></script><script src="main-es5.js" nomodule defer></script></body>