"Isn't there anyone who can help me?"
It is hard to guess with so little information about your project, storage and workflow.
My first guess is that your source files and primary project are on an external SSD. Under Edit > Preferences there is a choice for the "Scratch Disks". By default, those would be on your primary drive and it may not have the huge amount of space needed for all the temporary files in such a large project.
Another guess is that your project should probably be on your primary drive. I think I remember cases were Premiere Elements fails when installed anywhere but the primary drive.
If you have a corrupted source file, you may have to some searching. I'm still guessing, but you might try this..... Open a test project and import the first 50 clips, delete them and import the next 50. Keep going. If you get an import error, narrow it down to batches of 10.
... View more