Error in Running a Process with Custom Activity

[shiraishim (Shiraishi)]

What does this error means?
Could not load type ‘System.ValueTuple`2’ from assembly 'mscorlib, Version=4.0.0.0, Culture=neutral.
The error came from a Uipath process with a custom activity.

[Nithinkrishna]

Hey @shiraishim

Is this your own custom activity ?

Thanks
#nK