Not correct line error message, if you use 'Include "file.stil"' in your main file and there is an error in this file

[Zlin526F]

for example, your Main file:
STIL 1.0;

Include "blabla.stil"; # in this file is an error...
......
// # line 67 from your main file
// power on # line 68
//

than you get the error message:

ERROR: In the line number 68, column 3 [68,3]: # but this is the line number from your main-file
// power on
↑
Expected Signal block before any Timing block # the error message itself is correct, it comes from an error in the include file