Thanks for posting in the community! Since this error is specific to your account I'm going to move this conversation to a private ticket. A support agent will reach out via email in order to take a closer look. 

Hi.

I have the same problem with a note that this file can harm my computer and also I get a blank screen.

please advice.

Hello Yossi

Thanks for adding to this thread! 

The best way to have us look into the issue you are experienced and assist would be to file a support ticket here and make sure to include the following information:

* The URL to your Lucidchart document

* A screenshot of the error message you see

This is because the issue seems to be specific to your account or document and therefore we will need to take a look at your account to further investigate. Thank you!