Webpack compile error: TypeError: __WEBPACK_IMPORTED_MODULE_1__ … is not a function

So, this my Api Service Component, I'm using Axios:

import api from './Api.vue';

export default {
    name: 'app-feed-service',
    methods: {
        getPosts() {
            return api.get('posts/');
        }
    }
}

and some feed component

import AppSinglePost from './../Feed/Post.vue';
import AppFeedService from './../../api/Feed.vue';

export default {
    name: 'app-posts',
    components: {
        AppSinglePost
    },
    data() {
        return {
            posts: []
        }
    },
    created() {
        AppFeedService.getPosts().then((res) => {
            console.log(res);
        });
    }
}

and now the error:

TypeError: __WEBPACK_IMPORTED_MODULE_1__api_Feed_vue___default.a.getPosts is not a function

can anybody help?