Non of my surveys are working right now. After clicking "start survey" it loads the survey but a grey box with the text "Please wait..." apears and it wont load any further. 

One error appeared in the Developer Console (by pressing F12):

jquery-migrate.min.js?0ba92dc40e864dcda5e45306a910af9a:2 JQMIGRATE: Migrate is installed, version 1.4.1

jquery.min.js?0ba92dc40e864dcda5e45306a910af9a:2 Uncaught Error: Target selector invalid or missing!

    at Function.error (jquery.min.js?0ba92dc40e864dcda5e45306a910af9a:2)

    at HTMLDivElement._error (jquery.raty.js:342)

    at HTMLDivElement._target (jquery.raty.js:540)

    at HTMLDivElement.<anonymous> (jquery.raty.js:48)

    at Function.each (jquery.min.js?0ba92dc40e864dcda5e45306a910af9a:2)

    at a.fn.init.each (jquery.min.js?0ba92dc40e864dcda5e45306a910af9a:2)

    at a.fn.init.init (jquery.raty.js:17)

    at a.fn.init.$.fn.raty (jquery.raty.js:721)

    at Object.CjSurveyApi.onAfterSaveResponse (cj.surveys.min.js?v=4.3.5:753)

    at Object.CjSurveyApi.onAfterCreateResponse (cj.surveys.min.js?v=4.3.5:655)

I could not find anything on the internet maybe you could help me.

Thank you in advance!