Here is the full error

Parse error: parse error, unexpected ‘{‘ in /home/content/m/f/4/mf4people/html/blog/wp-content/themes/slidette/functions.php on line 146

FTP to your site and delete that theme’s folder (under /wp-content/themes/ThemeName). WordPress will then fall back to the Default theme.  Or you might to login and then select and theme.