How to resolve Revit "Error - cannot be ignored" when Harvesting
Earlier versions of AVAIL for Revit (Harvest mode) suppressed Revit "Error - cannot be ignored". This is changed in 5.6.0.0.
AVAIL for Revit 5.6.0.0 is in Preview Release (beta).
Download here: https://app.getavail.com/preview
Harvest will now respect Revit "Error - cannot be ignored" and cancel the Harvest process, to prevent incomplete Harvest output (an incomplete Sheet for example).

When you encounter "Error - cannot be ignored", resolve those errors in Revit, then Harvest again.
Steps to resolve Revit "Error - cannot be ignored":
With AVAIL:
Resolve errors in Revit before Harvesting again:
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Harvest errors are shown in the Harvest UI. Click "errors" to see a list of views and sheets that errored. Although this is not enough information to resolve "Errors - cannot be ignored", see item 3.
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There is information in the Harvest logs too, but this also is not enough to resolve the Revit errors.
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To resolve the errors, follow these steps:
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index the RVT container file into an AVAIL Channel, only for debugging purposes
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Select the container file in AVAIL desktop
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click the VIEW PROJECT button in the AVAIL Project Navigator tray in Revit
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an AVAIL dialog opens
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In the dialog, click Sheets or Drafting Views
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find the sheet or view of interest, and
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attempt to LOAD it into Revit (push the green Load button in the AVAIL popup).
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Specific errors will be shown in a Revit dialog box.
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The "Show" button in the dialog can be informative
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An error resolution button may be shown in the dialog (for example, "Unjoin elements")
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Resolve the errors in Revit, then Harvest again.
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Without AVAIL, Revit only:
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Use View>Insert Views From File
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Review and resolve the errors