Calendar Visual by MAQ software - 'Start date' and 'Events' are required fields

I had the same problem, and finally solve it.

Looks like someone complained in the MAQ software communnity about this too and they resolved the issue by releasing a "BETA" version that is not available in the "Visual Store" of the POWER BI desktop. So in order to install this BETA version you must go here: https://maqsoftware.zendesk.com/hc/en-us/articles/360061830292-Calendar-by-MAQ-Software-Beta-build-Version-4-0-2- and download the ".pbiviz" file. 

Next you need to open your power bi desktop report and "Import a visual from a file" selecting the one you just downloaded (Calendar by MAQ Software (Beta Build) - 4.0.2.pbiviz)

Please check the original conversation: 
https://maqsoftware.zendesk.com/hc/en-us/community/posts/4409540338196-Calendar-Visual-by-MAQ-Software-Display-Issue-when-switching-between-views

Hello Borx,

I have the same problem. The visual is empty after reopen PBI files. I have the message "'Start date' and 'Events' are required fields"inside the calendar visuel and then it disapears.

My post : https://community.powerbi.com/t5/Custom-Visuals-Development/Calendar-visual-by-MAQ-Blank-visual-when-reopen-desktop-app/td-p/2145020 

NB0 : I use the Power BI desktop app (French)

I also have this issue.

Hello,

It seems that there is a issue with date format.

I tried to change date format from the table to YY-MM-dd and it works so far.

I didn't try other format.

Regards,