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If the project uses a plugin you don't have installed, After Effects might struggle to define the properties associated with that plugin. How to Fix
Click "Yes" when asked if you want to delete the preferences file. Step 5: The "New Project" Import Trick If the project uses a plugin you don't
How to Fix the After Effects Error: "Asked to Create Unknown Property of Type" The Process Navigate to Edit > Purge >
Sometimes, After Effects tries to read from a corrupted cache file, leading to "Unknown Property" errors during preview or render. The Process Navigate to Edit > Purge > All Memory & Disk Cache. Click OK to confirm. Restart After Effects and try opening the project again. Step 4: Reset After Effects Preferences Step 4: Reset After Effects Preferences This error
This error typically stems from a version mismatch or a missing dependency. When After Effects opens a file, it builds a database of properties. If it finds a property tag that isn't defined in its current library, the system stalls. Common triggers include: