Check the HTML of the wiki page: it should contain a <img> tag (for
PNG files) to the generated PNG file. It is likely that you have a
misconfiguration in your Apache file, which prevents it to serve the
image as a static image file. You can double-check this easily: copy &
paste the <img> URL to a new tab of your browser, and see whether the
image appears. If not, check your Apache error log file to see whether
it reports that the file exists or not.
thanks for the debugging tip , it works now with following section in trac.ini
[graphviz]
cache_min_size = 5000000
cache_max_size = 10000000
cache_manager = yes
png_antialias = true
cache_max_count = 2000
cache_dir = /media/repo/TRAC/UnixSolutions/htdocs/gantt-charts
prefix_url=http://silinux1/UnixSolutions/chrome/site/gantt-charts
default_graph_fontsize = 10
cmd_path = /usr/bin
cache_min_count = 1500
default_graph_fontname = "Andale Mono"
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