If a physical location doesn't work the text should be coloured red afterwards.

[valentijnpeters]

example...

Capture Page Screenshot filename=c:\screenshot.png but that doesn't work (no write rights or bad format.

the the text should be red after the run.

[valentijnpeters]

also hint what is wrong. so in case couldnt write to directory or c:\temp\screenshot.pn is not correct format

[Zeckie]

When a robot test is run, it generates a html log that you can look at to figure out issues like this.