If your phone's partition table is corrupted (often indicated by an "Invalid PIT" or "PIT not found" error alongside the re-partition failure), you actually do need to re-partition.
Forgetting to uncheck “Re-Partition” after a previous flash attempt. Odin sometimes leaves it enabled by default.
If using a standalone PIT file, load it into the in Odin. 3. Flash All Four Files
If you must re-partition (e.g., to fix a boot loop or corrupted storage), you need the exact PIT file for your specific model and storage capacity.