Excel Writer (Cross platform) creates error, when protocol is called twice

Hi,

I have a strange problem with the Excel Writer (Cross platform). When I write data to an xls sheet via a protocol (see attached minimal example, with some dummy data) it works fine, the first time I call it, but creates a "java.io.FileNotFoundException" when started immediately after the first run of the protocol.

What am I doing wrong?

Best,

Tom