meteor__microscope/client/templates/includes/errors.html

<template name="errors">
  <div class="errors">
    {{#each errors}}
      {{> error }}
    {{/each}}
  </div>
</template>

<template name="error">
  <div class="alert alert-danger" role="alert">
    <button type="button" class="close" data-dismiss="alert">&times;</button>
    {{ message }}
  </div>
</template>