Hi Suyash, To add to what TimvH mentioned, dealing with library and compiler mismatches is one of the most common hurdles when upgrading the CODESYS IDE. Here are a few best practices to help you manage your projects safely moving forward: Always use Project Archives: Instead of saving a standard .project file, go to File > Project Archive > Save/Send. This bundles the project together with the exact library versions, device descriptions, and visualization profiles it requires, making it highly portable....