Install Plugins eror

Hello,

Please help me. When I install plugins WP Clone by WP Academy 2.1.8 in wp-admin I get an error message :
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Downloading install package from https://downloads.wordpress.org/plugin/wp-clone-by-wp-academy.2.1.8.zip…

Download failed. Could not open handle for fopen() to /tmp/wp-clone-by-wp-academy.tmp

Return to Plugin Installer
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Why ? Please Help Me ? I can’t Install that