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Circos could not find the configuration file [%s]. To run Circos, you need to specify this file using the -conf flag. The configuration file contains all the parameters that define the image, including input files, image size, formatting, etc.
If you do not use the -conf flag, Circos will attempt to look for a file circos.conf in several reasonable places such as . etc/ ../etc
To see where Circos looks for the file, use
circos -debug_flag io
To see how configuration files work, create the example image, whose configuration and data are found in example/. From the Circos distribution directory,
cd example
../bin/circos -conf ./circos.conf
or use the 'run' script (UNIX only).
Configuration files are described here
http://circos.ca/tutorials/lessons/configuration/configuration_files/
and the use of command-line flags, such as -conf, is described here
http://circos.ca/tutorials/lessons/configuration/runtime_parameters/
Windows users unfamiliar with Perl should read
http://circos.ca/tutorials/lessons/configuration/unix_vs_windows/
This error can also be produced if supporting configuration files, such as track defaults, cannot be read.
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