1) params.ini is not present / has not been installed. So you download the template, extract params.ini, and copy it to your webdirectory in /templates/jf_texturia and set permissions to "775"
2) params.ini is not writeable. So you have to use a ftp program or your webftp application and set permissions to "775" of /templates/jf_texturia/params.ini. After this you can modify and save your params.ini from the Joomla! backend template configuration page.
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