Thanks for your quick reply.
If I want to change in DirectAdmin the permission of this folder from 775 to 777 the following error occured:
Unable to set file permissions
Details
Unable to chmod /domains/trendygifts.eu/public_html/wp-content/uploads/wpsc-invoices to 777
I can change permissions from other folders without errors.
Please help me how to solve this.
Thanks In advance.
Arjan