probleem met uploaden

probeerde net een png-file te uploaden, maar krijg deze foutmelding:

De volgende fout is opgetreden:
copy(/home/admin/domains/schaatsforum.nl/public_html/internal_data/attachments/1/1383-99d15ed7684a2764f8a071bc88376d92.data): failed to open stream: Permission denied

1. XenForo_Application::handlePhpError()
2. copy() in XenForo/Helper/File.php at line 253
3. XenForo_Helper_File::safeRename() in XenForo/DataWriter/AttachmentData.php at line 265
4. XenForo_DataWriter_AttachmentData->_moveFile() in XenForo/DataWriter/AttachmentData.php at line 224
5. XenForo_DataWriter_AttachmentData->_writeAttachmentFile() in XenForo/DataWriter/AttachmentData.php at line 144
6. XenForo_DataWriter_AttachmentData->_postSave() in XenForo/DataWriter.php at line 1423
7. XenForo_DataWriter->save() in XenForo/Model/Attachment.php at line 539
8. XenForo_Model_Attachment->insertUploadedAttachmentData() in XenForo/ControllerPublic/Attachment.php at line 205
9. XenForo_ControllerPublic_Attachment->actionDoUpload() in XenForo/FrontController.php at line 351
10. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
11. XenForo_FrontController->run() in /home/admin/domains/schaatsforum.nl/public_html/index.php at line 13

O.a. @SprintMaster had dit probleem ook al opgemerkt. Hopelijk wordt het snel opgelost!

merci!

test 123

edit: lijkt gelukt!