that didn't help
the error comes also when i open other projects, allthough i didn't use these samples in other projects.
allthough i set up a new instrument on the pads, the error message stil comes up. then i had another idea: when the error message comes up, you can search the samples on your computer. so i took a wav-file and named it the same, as the files that spark couldn't find and put it back in the project. but even that couldn't trick the software. it's still searching for those deleted samples.
i also tried to save the project under a new name, after i exchanged the samples with other original spark sounds. it stil keeps asking me for those samples i've deleted.
i exported the project now from my user-folder and the error message doesn't show up anymore. but that's stil kind of weird... and of course i would like to keep this project without error messages. any other ideas?