Hello everyone, I got the red cross.
Open the Localization Dashboard and check the “Target Dependencies” setting in the “Gather Text” section on the right.
If Engine, Editor, etc. are included, uncheck them.
Also, if you have specified file names, such as “path/to/ST_,” limit the file names to “path/to/” and limit the folder names only.
At least it worked for me in 5.6.
It is worth checking the log.
The logs obtained via “Copy Log” or “Save Log” had the detected asset names output starting from line 279.
This information may be too late, but I will leave it here for future reference.