@ezg12 Hi. It seems you are trying to open the file as a zip. First manually remove the .zip extension so the file has the .pclx extension instead.
Pencil2D already handles the zip packaging process but starts from the PCLX format, so having it try to open a zip will result in a error.
If after trying this, Pencil2D still does not open your file, it’s either corrupted in a different way or there’s a different issue that could be creating this problem for you. In that case please share the file with our dev team by uploading it here so we can take a look. Thx.
To add to what @JoseMoreno has already said: remove the .zip extension if it is incorrectly labeled as a zip file. If you have zipped a pclx file, extract/unzip the pclx file from it instead of removing the extension.
It does not end with .pclx. The file you shared ends with .pclx(2).zip, and the file path in the initial error log has an extension of .pclx(1).zip. Fix the extension and it opens fine with v0.7.2 of Pencil2D.