Cannot add any route

Hi there,
I feel really excited to use your plugin, but I can’t add any route because all I can see after pressing Add Route button is blank page.
I’ve followed all the instructions in troubleshooting page and here is what if got in the dev console:
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TypeError: this.container is null[More info] WidgetSingleRoute.js:5:2
CMMRM_WidgetSingleRoute https://mysite.com/wp-content/plugins/cm-route-manager/asset/js/maps/WidgetSingleRoute.js:5:2
CMMRM_Editor https://mysite.com/wp-content/plugins/cm-route-manager/asset/js/maps/Editor.js:3:2
<anonymous> https://mysite.com/trasy/routes/add/:281:20
n.Callbacks/i https://mysite.com/wp-includes/js/jquery/jquery.js:2:27444
n.Callbacks/j.fireWith https://mysite.com/wp-includes/js/jquery/jquery.js:2:28213
.ready https://mysite.com/wp-includes/js/jquery/jquery.js:2:30004
K https://mysite.com/wp-includes/js/jquery/jquery.js:2:30366
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Is it plugin script error or any other?
Kind regards
whateverbrother