Lots of cache errors

[Owdy]

After upgrading to 4.0.8, i got lots of these in my log. Anything to worry about?

PHP Warning:  fopen(/var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/cache/tmp/minify_ipb_styles,ipb_common,calendar_select,prettify.css_5a1410082251a09231f55f0e0a077359): failed to open stream: No such file or directory in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 100
PHP Warning:  flock() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 101
PHP Warning:  stream_get_contents() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 102
PHP Warning:  flock() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 103
PHP Warning:  fclose() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/p
PHP Warning:  fopen(/var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/cache/tmp/minify_ipb_styles,ipb_common,calendar_select,prettify.css_4ebc7acf3940420c8ef7dd71d1b200bc): failed to open stream: No such file or directory in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 100
PHP Warning:  flock() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 101
PHP Warning:  stream_get_contents() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 102
PHP Warning:  flock() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 103
PHP Warning:  fclose() expects parameter 1 to be resource, boolean given in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/p
PHP Warning:  fopen(/var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/cache/tmp/minify_ipb_styles,calendar_select,ipb_common,ipb_ckeditor,prettify.css_0a74b7773d19802c3a10139122976ad1): failed to open stream: No such file or directory in /var/www/vhosts/2/125588/webspace/httpdocs/hoitajat.net/public/min/lib/Minify/Cache/File.php on line 100