@font-face {
  font-family: 'LibreFranklin-SemiBold',
  font-style: 'normal',
  font-weight: 'normal',
  src: url('/*server_location*/theme/15/libre-franklin/libre-franklin-v2-latin-600.eot'); /* IE9 Compat Modes */
  src: local('Libre Franklin SemiBold'), local('LibreFranklin-SemiBold'),
   url('/*server_location*/theme/15/libre-franklin/libre-franklin-v2-latin-600.eot?#iefix') format('embedded-opentype'), /* IE6-IE8 */
   url('/*server_location*/theme/15/libre-franklin/libre-franklin-v2-latin-600.woff2') format('woff2'), /* Super Modern Browsers */
   url('/*server_location*/theme/15/libre-franklin/libre-franklin-v2-latin-600.woff') format('woff'), /* Modern Browsers */
   url('/*server_location*/theme/15/libre-franklin/libre-franklin-v2-latin-600.ttf') format('truetype'), /* Safari, Android, iOS */
   url('/*server_location*/theme/15/libre-franklin/libre-franklin-v2-latin-600.svg#LibreFranklin') format('svg'); /* Legacy iOS */
}

.my-class {
    font-family: LibreFranklin-SemiBold;
}

CSS3111: @font-face encounted unknown error.
File: libre-franklin-vs-latin-600-eot.