java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at com.atlassian.confluence.pages.AttachmentUtils.getContainingFolder(AttachmentUtils.java:35)
at com.atlassian.confluence.pages.DefaultAttachmentManager.removeAttachmentFromServer(DefaultAttachmentManager.java:97)
at com.atlassian.confluence.pages.DelegatorAttachmentManager.removeAttachmentFromServer(DelegatorAttachmentManager.java:59)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)

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