Thumbnail generation unsuccessful

• DEBUG post_id=134
• DEBUG Found YAPB image
• DEBUG w=200
• ERROR Couldn't save C:\inetpub\wwwroot\MARCO\mcseblog.nl\wp-content\plugins\yet-another-photoblog\cache\dl380g6.6426z0237w8ww44gcsosg0s8o.dyvz4sut4lc04scss800sgw48.th.jpeg - Please check cache directory permissions