KiCAD Schematic symbol error

Hi
I’m using KiCAD KiCAD 5.1.6 Stable version.
Recently have created a symbol and added in schematic pages and went back modified symbol and when I updated in schematic , symbol is lost in sch with question mark.

This happens when the symbol library is not in the project library preferences

2 Likes

And if you did not take care about the cache and rescue process (libs missing is necessary for this to happen but not enough on its own)