Dear Vincent, Thank you for responding. I installed libmagiccore-6.q16-2-extra, then svg file succesfully converted to png without errors.
> We cannot have the libmagickcore-6.q16-2-extra package installed by > default, the best we could do is to clarify for what the -extra > package is needed in the package description. I agree with that. I would be glad if the package descripiton say some hint of -extra package. Takahide Nojima