[TYPO3-calendar] Error while using "show list view" in month view

[Thomas Jirasko]

Hi,

when I try to show the list view underneath the month view on one page, 
cal throws the following uncaught TYPO3 exeption, when the option "show 
in list view" is active in month view:

Tried resolving a template file for controller action "Standard->index" 
in format ".html", but none of the paths contained the expected template 
file ().

TYPO3 version: 8.7.2
cal version 1.11.1
using cal fluid templates with: plugin.tx_cal_controller.activateFluid = 1

Can anyone help me with this issue?

Thanks!