Much errors in Apache error log

Everything works in SIGE but there are much errors in the Apache error log, please can you help me with this?

[Thu Oct 30 07:15:54.380852 2014] [fcgid:warn] [pid 858493:tid 140415848077056] [client 93.142.229.199:54298] mod_fcgid: stderr: PHP Warning: imagedestroy() expects parameter 1 to be resource, boolean given in /home/dalen21/domains/avdweb.nl/public_html/plugins/content/sige/plugin_sige/showthumb.php on line 145, referer: www.avdweb.nl/holiday-photos/holiday-photos-valencia.html
[Thu Oct 30 07:15:54.517421 2014] [fcgid:warn] [pid 858493:tid 140415743178496] [client 93.142.229.199:54298] mod_fcgid: stderr: PHP Warning: imagedestroy() expects parameter 1 to be resource, boolean given in /home/dalen21/domains/avdweb.nl/public_html/plugins/content/sige/plugin_sige/showthumb.php on line 145, referer: www.avdweb.nl/holiday-photos/holiday-photos-valencia.html
[Thu Oct 30 07:15:54.699540 2014] [fcgid:warn] [pid 858493:tid 140415879546624] [client 93.142.229.199:54298] mod_fcgid: stderr: PHP Warning: imagedestroy() expects parameter 1 to be resource, boolean given in /home/dalen21/domains/avdweb.nl/public_html/plugins/content/sige/plugin_sige/showthumb.php on line 145, referer: www.avdweb.nl/holiday-photos/holiday-photos-valencia.html
[Thu Oct 30 07:15:54.839408 2014] [fcgid:warn] [pid 858493:tid 140415785137920] [client 93.142.229.199:54298] mod_fcgid: stderr: PHP Warning: imagedestroy() expects parameter 1 to

etcetera............

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