Cannot find the solution to this (1.9 MB)
The error is something like this “Invoke Workflow File: Cannot set unknown member ‘UiPath.Core.Activities.OpenBrowser.CommunicationMethod’.”
I cant find out exactly what to do. Please help


May I know what browser are you using here ?

I think the attach browser automatically uses internet explorer to open the website :thinking:


It’s not like that. You can select required browser under Browser Type option.

But when I tested it individually giving default values it automatically opened internet explorer. Why is that so??

Anyways I’ll try what you said…

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Hello again…
I tried to specify the browser type but the error still persists :confused:

Hello Kedar,

Error Message: "Invoke Workflow File: Cannot set unknown member ‘UiPath.Core.Activities.OpenBrowser.CommunicationMethod’.”

Why does this error come up?
“Cannot create unknown member” comes up when the version of the package which has the defined member\type (here Communication Method is that member) isn’t added (even added and removed later) as a dependency to the project

For example, Communication Method property in the Open Browser activity was introduced in UiPath.UIAutomation.Activities version: 19.10.1. If your project was developed with a dependency on UIAutomation package version >=19.10.1 and later lowered to a lesser version (i.e <=19.7.0), then Communication Method couldn’t be found as it wasn’t available in those (lower) versions.

Release notes of UiPath.UIAutomation.Activities package

What could be the solution?
Upgrade the UiPath.UIAutomation.Activities package in the same project to a higher version (i.e >=19.10.1)

PLMK if you have any clarifications.


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