Problem creating tasks on a gmail account

I’m using the latest ver for Windows 10, I have eMclient connected to my gmail account, both email and calendar work fine
I have 3 folders created under tasks, when I create a task in any of the folders I get an error (I’ve deleted my email address below):

[Google Calendar] Uploading item(s) to folder ‘[email protected]/Tasks’ failed due to the following error: Object reference not set to an instance of an object.

If I create a task in another app it gets synched to gmail ok but not to eMclient.

Any thoughts on what the problem might be

Thanks,
Paul