svn --diff-cmd not working

Dear all, I configured svn to call a wrapper script for diff command but
encountered following error:

~/knowsg.com/steps $ svn diff command_at_development.txt
Index: command_at_development.txt
===================================================================
exec of '/home/knowsg_admin/bin/svndiffwrap.sh' failed: No such file or
directorysvn: '/home/knowsg_admin/bin/svndiffwrap.sh' returned 255

part of ~/.subversion/config is like this:

### Set diff-cmd to the absolute path of your 'diff' program.
### This will override the compile-time default, which is to use
### Subversion's internal diff implementation.
# diff-cmd = diff_program (diff, gdiff, etc.)
diff-cmd = /home/knowsg_admin/bin/svndiffwrap.sh

But the script is right there with executing privileges:

~/knowsg.com/steps $ ll /home/knowsg_admin/bin
total 4.0K
-rwxr-xr-x 1 knowsg_admin knowsg_admin 369 Apr 5 11:06 svndiffwrap.sh*

Even its parent directory is on $PATH:
~/knowsg.com/steps $ echo $PATH
/usr/lib/qt-3.3/bin:/usr/local/bin:/usr/bin:/bin:/usr/local/sbin:/usr/sbin:
/sbin:/home/knowsg_admin/bin

Can anybody help me with this please? Thanks.
Received on 2016-04-07 09:21:42 CEST