the stack trace of the error:
daypilot-all.min.js:10 Uncaught String expected
text @ daypilot-all.min.js:10
(anonymous) @ daypilot-all.min.js:26
a.each @ daypilot-all.min.js:9
(anonymous) @ daypilot-all.min.js:26
a.each @ daypilot-all.min.js:9
m.generate @ daypilot-all.min.js:26
exportAs @ daypilot-all.min.js:25
(anonymous) @ VM1225:26
dispatch @ jquery-2.2.4.js:4737
elemData.handle @ jquery-2.2.4.js:4549