You should follow below steps :

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1.Check whether ImageMagick has been installed or not.
which convert or which montage like this or locate ImageMagick. Or rpm -qa |grep ImageMagic
2. yum install ImageMagick
3. Now check once again.
4. rpm -ql ImageMagic| more
5. rpm -qf /usr/local/bin/convert //to check the exact rpm which has used for this binary.
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That’s it. Try now 🙂