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You have a "space" inside path to your working folder. C:\Users\ bertjes pc \AppData\Roaming\Arduino15\packages\Z-Uno\tools\zuno_toolchain\00.02.10/zuno_toolchain/sdcc/bin/ Quick fix is to rename your working directory or user(the most simple way is to rename your user or create a new one....

Hi, Bert. Looks like something is wrong with IDE parameters. Can you please enable verbose mode during compiling/uploading(see preferences of IDE) and post the full output there.