Cronjob error – Missed schedule

I’ve scheduled some posts. None of them was published. (Missed schedule)

From cronjob I got this error:
<b>Parse error</b>: syntax error, unexpected ‘:’, expecting ‘{‘ in <b>/home/xxxxx/public_html/wp-content/plugins/sunny-purge-extra-urls-example-master/sunny-purge-extra-urls-example.php</b> on line <b>48</b><br />

Can you hemp me with that issue?
Thank you!

PS: After I deactivated Sunny Purge Extra URLs Example plugin, I got this error from cronjob:
<br />
<b>Parse error</b>: syntax error, unexpected ‘class’ (T_CLASS), expecting identifier (T_STRING) in <b>/home/xxxxx/public_html/wp-content/plugins/sunny/src/Sunny.php</b> on line <b>57</b><br />