problem with paths

full log

domain_name
WP version: 3.8.1
EWWW IO version: 180
ewww_image_optimizer_admin_init()
ewww_image_optimizer_init()
ewww_image_optimizer_cloud_verify()
ewww_image_optimizer_notice_utils()
ewww_image_optimizer_exec_check()
disable_functions =
suhosin_blacklist =
ewww_image_optimizer_safemode_check()
safe_mode =
ewww_image_optimizer_path_check()
ewww_image_optimizer_tool_found()
testing case: j at jpegtran
ewww_image_optimizer_tool_found()
testing case: j at /usr/bin/jpegtran
ewww_image_optimizer_tool_found()
testing case: j at /usr/local/bin/jpegtran
ewww_image_optimizer_tool_found()
testing case: j at /usr/gnu/bin/jpegtran
ewww_image_optimizer_tool_found()
testing case: o at optipng
ewww_image_optimizer_tool_found()
testing case: o at /usr/bin/optipng
ewww_image_optimizer_tool_found()
testing case: o at /usr/local/bin/optipng
ewww_image_optimizer_tool_found()
testing case: o at /usr/gnu/bin/optipng
ewww_image_optimizer_tool_found()
testing case: g at gifsicle
ewww_image_optimizer_tool_found()
testing case: g at /usr/bin/gifsicle
ewww_image_optimizer_tool_found()
testing case: g at /usr/local/bin/gifsicle
ewww_image_optimizer_tool_found()
testing case: g at /usr/gnu/bin/gifsicle
ewww_image_optimizer_tool_found()
testing case: p at pngout
ewww_image_optimizer_tool_found()
testing case: p at /usr/bin/pngout
ewww_image_optimizer_tool_found()
testing case: p at /usr/local/bin/pngout
ewww_image_optimizer_tool_found()
testing case: p at /usr/gnu/bin/pngout
ewww_image_optimizer_tool_found()
testing case: p at pngout-static
ewww_image_optimizer_tool_found()
testing case: p at /usr/bin/pngout-static
ewww_image_optimizer_tool_found()
testing case: p at /usr/local/bin/pngout-static
ewww_image_optimizer_tool_found()
testing case: p at /usr/gnu/bin/pngout-static
ewww_image_optimizer_options()
ewww_image_optimizer_install_paths()
CPU architecture: i686
generated paths:
/home/domain_name/domains/domain_name.pl/public_html/wp-content/plugins/ewww-image-optimizer/jpegtran-linux
/home/domain_name/domains/domain_name.pl/public_html/wp-content/plugins/ewww-image-optimizer/optipng-linux
/home/domain_name/domains/domain_name.pl/public_html/wp-content/plugins/ewww-image-optimizer/gifsicle-linux
/home/domain_name/domains/domain_name.pl/public_html/wp-content/ewww/jpegtran
/home/domain_name/domains/domain_name.pl/public_html/wp-content/ewww/optipng
/home/domain_name/domains/domain_name.pl/public_html/wp-content/ewww/gifsicle
ewww_image_optimizer_tool_found()
testing case: j at
ewww_image_optimizer_tool_found()
testing case: o at
ewww_image_optimizer_tool_found()
testing case: g at
ewww_image_optimizer_tool_found()
testing case: p at
ewww_image_optimizer_gd_support()
GD found, supports:
GD Version: bundled (2.0.34 compatible)
FreeType Support: 1
FreeType Linkage: with freetype
T1Lib Support: 1
GIF Read Support: 1
GIF Create Support: 1
JPG Support: 1
PNG Support: 1
WBMP Support: 1
XPM Support:
XBM Support: 1
JIS-mapped Japanese Font Support:
ewww_image_optimizer_tool_found()
testing case: i at convert
convert: Version: ImageMagick 6.3.7 03/24/09 Q16 https://www.imagemagick.org
ewww_image_optimizer_safemode_check()
safe_mode =
ewww_image_optimizer_exec_check()
disable_functions =
suhosin_blacklist =
ewww_image_optimizer_tool_found()
testing case: f at file
ewww_image_optimizer_tool_found()
testing case: f at /usr/bin/file
ewww_image_optimizer_tool_found()
testing case: f at /usr/local/bin/file
ewww_image_optimizer_tool_found()
testing case: f at /usr/gnu/bin/file
ewww_image_optimizer_tool_found()
testing case: n at nice
nice:
ewww_image_optimizer_tool_found()
testing case: n at /usr/bin/nice
/usr/bin/nice:
ewww_image_optimizer_tool_found()
testing case: n at /usr/local/bin/nice
/usr/local/bin/nice:
ewww_image_optimizer_tool_found()
testing case: n at /usr/gnu/bin/nice
/usr/gnu/bin/nice:
ewww_image_optimizer_tool_found()
testing case: t at tar
ewww_image_optimizer_tool_found()
testing case: t at /usr/bin/tar
ewww_image_optimizer_tool_found()
testing case: t at /usr/local/bin/tar
ewww_image_optimizer_tool_found()
testing case: t at /usr/gnu/bin/tar
ewww_image_optimizer_jpeg_background()
ewww_image_optimizer_jpeg_background()
ewww_image_optimizer_jpg_quality()

Looks like something strange with your server. Are you the server admin, or does someone else run it for you (like a webhost or something)?