IE 11 Cannot modify non-writable property...

Created by: dahliacreative

I've followed the steps to support ie11 but keep just getting the error Cannot modify non-writable property length.

I've tried babel polyfill, core-js and react app polyfill and none of them are working for me. I've reinstalled all deps and cleared caches.

Can be seen at https://www.finedonlocalhistorysociety.co.uk/ My repo is here https://github.com/dahliacreative/flhs