There's a conversation about this here: http://narkive.com/4QvPqDp2.2
Olivier Sessink, writing in 2012:
Post by Martin crysman ZahradnÃk
Hello, I am just wondering why I cannot use tidy directly from BF... If I try
The command tidy -qe '%i' exited with error code 512.
fixed in svn, commands with %i and %o work
again.
but the exit status message is still there, which is useless for
commands like tidy that generate an exit code for faulty html when
everything is working as expected.
I'm a bit in doubt how to handle this for 2.2.4:
1) remove the dialog - that means that bluefish will also not give an
error message if tidy is for example not installed at all
2) keep the dialog - and bluefish will always show this error message if the html is not perfect
Is there by any chance some errors in your HTML? Do you get the error with a syntacticly perfect "Hello, World" HTML sample?