This error I got from ProjectManagement AwareIM sample. The below is how to create the error
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Open a task in edit form (I select a task from Gant Chart)
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Click "Add New" button in Documents tab
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Try upload a file (it's up to you) and type the title as you want then click Save button
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Try show the edit form again of the task that you edit before
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Then show edit form again of the Document that we add before in Documents tab
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Try remove the Document File (just click Remove button of Document File) then you will get the below image
You can test it from THIS AwareIM sample directly
My question:
How to solve it?
