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A TimThumb error has occured

The following error(s) occured:

Could not open the lockfile for writing an image.

Query String : src=https://www.tageszeitung.it/wp-content/uploads/2015/01/teacher-teaching-or-educate-at-the-board-a-class-in-school.jpg&h=275&w=599&zc=1
TimThumb version : 2.8.10