How are your workspace parameters setup? I have gotten this error before when I had parameters that were dependent on other parameters, and in the order of the listed parameters, the dependent parameter was ordered before the parameter it was calling.

I've also read on the forums this could be a bug within the software, so you may need to loop an FME team member in.

This is the first time I touch the programme, so these are the default parameters.

Hi @revillauni​, this looks like it could be a bug in the ECW writer running a translation via the Quick Translator. A workaround would be to open Workbench for the translation instead. I will file this issue, thank you for bringing it to our attention.