It’s because “`” (template strings) is not supported by IE : http://caniuse.com/#search=string
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Template_literals
See https://stackoverflow.com/a/27678299/2195875
To avoid this error you can either use a ES6 to ES5 transpiler, or just directly write valid ES5 javascript:
instead of
`string text ${expression} string text`
write
“string text “+expression+” string text”