Method not found: 'Void UiPath.Core.Activities.Target.set_WaitForReady(UiPath.Core.WaitForReady)'

[hamza.ait_abdelouahab]

hi,
i have a probleme with the waitForReady methode as you can see in the picture.
the full Error message is :
Error ERROR Validation Error Method not found: 'Void UiPath.Core.Activities.Target.set_WaitForReady(UiPath.Core.WaitForReady)'. SAP_De_ME22N_6.5.1 Set all purchase order items to Delivery Complete.xaml
and at the same time this Error apear:
package source connect has encountered the following error uipath...

i would be grteful if someone could help me.
thanks.

[Shubham_Dutta]

Hi @hamza.ait_abdelouahab ,
You should compile the library with a newer version of UiPath.System.Activities
This issue happens when you compile a library with an older version of UiPath.System.Activities but you use that library in a process with a newer version of UiPath.System.Activities

Please check out Important! note here: About Libraries

Thanks & Regards,
Shubham Dutta

[ushu (Usha kiranmai)]

Hello @hamza.ait_abdelouahab - Have a look on the below link

Error after upgrade library: Method not found: 'Void UiPath.Core.Activities.LogMessage.set_Level(UiPath.Core.Activities.CurentLogLevel)

After I release a new library package and upgrade this package in another project, I start getting this errors that start with: “Method not found: 'Void UiPath.Core.Activities.LogMessage.set_Level(UiPath.Core.Activities.CurentLogLevel)…” The following messages are the name of the components. The library was published with no error. The error still occurs after I revert to the previous library package Any suggestions on that? thanks! Update: I recently upgrade UiPath Studio from 2019.4.4 to 201…

[Shubham_Dutta]

Hi @hamza.ait_abdelouahab ,
If you do not have anymore queries please mark the solution and close the thread.

Thanks & Regards,
Shubham Dutta