ETAB Push throws "Unable to cast object of type 'System.Int32' to type 'System.String'"

### Description
When running Push on the ETAB adapter, I consistently get the following error:

> This component failed to run properly.
> Error: Unable to cast object of type 'System.Int32' to type 'System.String'.
> Occured in BH.UI.Base.Caller.Run(List`1 inputs)
> called from BH.UI.Base.Caller.Run()

This happens every time.

### Attachments
GH definition attached below:

Start by opening the attached GH definition and reproducing the ETAB adapter Push failure. Trace the error from BH.UI.Base.Caller.Run(List inputs), which is the entry point named in the report; the issue is done when Push completes without the Int32-to-String cast exception.

Written by the indexing model from the issue text.