Hello Suyash, This is a very common issue when starting with CODESYS, so don’t worry — you’re not alone. When you install the latest version of the CODESYS IDE, library mismatches usually happen because your existing project was created with a different compiler version or specific library versions that are no longer the default in the new installation. Here’s how you can manage your projects more safely going forward: Use the Library Manager properly Open your project → Go to Library Manager → Check...