PDF Viewer

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Hi,

When adding a pdf file with the pdf viewer, I get this message :
"Use of undefined constant external_url - assumed 'external_url' (this will throw an Error in a future version of PHP)"
Is it because I don't fill the external url box ?
But what is the eternal url for a file loaded in the file manager ?
Best regards
Vincent Le Mieux

 
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ConcreteOwl
https://www.concrete5.org/marketplace/addons/pdf-viewer1/support/error-using-pdf-viewer/