Exception: Append Range - Excel Data: File contains corrupted data

Hello,

I am trying to append a WB Range but I keep getting the following error: Exception: Append Range - Excel Data: File contains corrupted data

I have tried adding delays and killing Excel processes before this action takes place and nothing. I have also tried to append the range inside an Excel Application Scope and the following error appears: Excel application scope: exception from HRESULT: 0x800A03ec

Any ideas?

Thank you!