There are a few different reasons this error will occur.

The image or file size is too large

If the image or file exceeds the maximum file size limit, the upload will not succeed. For large images, consider reducing the file size prior to uploading.

A secure SSL connection cannot be established

If your site is configured to require an SSL connection for all administrative pages (which is the case for most sites hosted by Blackbaud), you must access your site via an address that exists on your SSL certificate. This is primary site URL associated with your NetCommunity website.

If SSL is required for administrative pages and you access your site using an alternate address, like a Blackbaud CNAME alias (siteID.bbnc.bbcust.com) or IP address, a secure SSL connection will not be established and your upload will not succeed.

Confirm the Primary Site URL for NetCommunity:
  1. While logged into the NetCommunity website, navigate to Administration>Sites & Settings
  2. Click the site you're wanting to upload images to in the left hand corner
  3. Locate the Primary Site URL and note it
    • The Primary Site URL is the URL you should be logging into: YourPrimarySiteURL/login.aspx

If your NetCommunity website is new (i.e. not yet live) and you are not yet able to access it via its permanent, public URL, you will need to add an entry to your local computer's hosts file. Your hosts file is a simple text document where you can associate web addresses with server IP addresses. In this hosts file, you'll add an entry that (just for your computer) associates your site's permanent web address with the actual IP address of the web server where your NetCommunity site lives. Once this is done, from your computer you would be able to type your site's permanent URL into your browser address bar and actually reach your NetCommunity site, even though the site is not live for anyone else using the same URL. Once your website is live and accessible by the permanent site URL, you may remove this entry from your local hosts file.

If the image was saved in Adobe Photoshop you may need to change the properties of the image.  This can be done by simply saving the image in a different photo editor such as paint.  In order to update the properties of the image please open the image in Microsoft Paint and re-save the image with a new name.  Attempt to upload the new image to the BBNC image library. 

 
Disable Flash in your browser
 
Chrome:
  1. Type chrome://settings/content into the URL bar
  2. Click to disable Flash
 
Firefox:
  1. Go to Tools > Plug-ins > Add-ons
  2. Select to disable Shockwave Flash
 
Internet Explorer:
  1. Go to Tools > Internet Options > Programs > Manage Add-ons
  2. Select "All Add-ons" from the "Show" dropdown
  3. Click on Shockwave, and select Disable
 
Safari 10.10 and lower:
  1. In Safari > Preferences > Security > Web Content
  2. Uncheck the box next to "Enable plug-ins"
Safari Mac OS X 10.11, macOS 10.12, and later
  1. Open Safari, and choose Safari > Preferences.
  2. Click the Websites tab and scroll down to the Plug-ins section. Locate the Adobe Flash Player entry.
  3. Unmark the box to disable Flash Player.