Issues with UiPath.Email.Activities - upgrading or downgrading both create issues

[kkiw (Henry Wang)]

Hi all,

My robot is running perfectly well in Studio, but unfortunately fault when it’s run on the unattended bot on the bot server.

This is the error message that is displayed in the Orchestrator:
System error at initialization: Length cannot be less than zero. Parameter name: length at Source: Save Attachments

I found this related forum post about it:

Save Attachment - Length cannot be less than zero

Hello, I use Save Attachment to download PDF file from email, however for one email case I got below error: [image] The activity works perfectly fine on any other emails, but just this one got the issue. Actually I donot see any difference on that email. Did anyone experience same issue before? and why error is about parameter “length”, I can not find any details about “length” for Save Attachment.

The solution to the problem was to update the version of the packade “UiPath.Mail.Activities” to 1.11.1-alpha. However, when this is done I get another error message:
Cannot create unknown type ‘{**}GetOutlookMailMessages’. at Source: System.Xaml

To this, I found another forum post:

Cannot create unknown type '{http://schemas.uipath.com/workflow/activities}StartProcess'

Hi all, my Robot is running very well in Studio, but if I want to run unattended on the Bot Server I get the following error message: Cannot create unknown type ‘{http://schemas.uipath.com/workflow/activities}StartProcess’. The same if I try to run it from Command Line on the Bot Server. Version is 19.10.2 and UiAutomation Activities is 20.4.2 Is this a problem? Thanks Volker

This forum post seems to state that I should downgrade the version of the UiPath email package…

So in summary: I get problems unless I update the version, but when I do, I encounter another problem which is also related to the UiPath.Email.Activities-package. I am feeling kind of stuck in this issue. Does anyone have a solution for the issue?

Many thanks!

[kkiw (Henry Wang)]

Here’s my workflow in Studio for reference

[liu_shubin (Shubin)]

@kkiw

ength at Source: Save Attachments

The issue is caused by “Save Attachments” activity when there is no attachment in the email. You can check whether there is attachment or not before running the “Save Attachments” activity.

Refer to the screen below for your reference.

[kkiw (Henry Wang)]

This seems to have solved the issue. Thank you very much!

[SHAF_MAIRAJ (SM)]

Hi @kkiw

I recommend you to use RE Framework

Regards,
Shaf