Thumbnail generation unsuccessful

• DEBUG post_id=142
• DEBUG Found YAPB image
• DEBUG w=75
• ERROR Couldn't save /home/mstomp/domains/masaiclinic.ca/public_html/wp-content/uploads/yapb_cache/carol_agm_09_thumb.7enu3yj52hkwoo0kgsssoso80.370qmxy2xp44cgk0g8ocsgs4g.th.jpeg - Please check cache directory permissions