Here are some solutions to common problems that other users have shared with us.
Have you made sure to export only Posts (when using the file export option)?
Wordpress offers you the option to export a file that includes both Pages and Posts, or just Posts. You must select to export only posts in order for the Blog Import feature to correctly import your blog file. Squarespace cannot import additional pages along with your posts.
Do you have Matching Author Names?
If you have multiple authors, make sure you have created accounts for these authors before you import your journal -- author names should match the Display Names of the authors in your Squarespace account.
Are you entering the URL you use to access your site?
When entering the URL for your the blog to be imported, please enter the URL that you currently use to reference your blog, whether this is a custom domain URL or a subdomain like yoursite.wordpress.com. Finally, it is very important if you're using a custom domain for your current site you must NOT map that domain to your Squarespace site until your import request is complete. Doing so could cause referenced media files not to be transferred along with your imported entries.
Have you Enabled XML-RPC in Wordpress?
If you have a self-hosted Wordpress site, you will need to make sure that XML-RPC is enabled within your Wordpress admin area in Settings > Writing > Remote Publishing.
Are you using the quicktag excerpt function in your entries?
If you are using the [!--more--] excerpt feature in your Wordpress blog, this can truncate your entries when attempting to import them over. The importer does not support this tag. You can remove the read more tag from your entries before importing, or, use the import by file method and remove all instances of this tag from your xml file prior to import.
Are you using the latest version of Wordpress?
We actively support the most recent version of Wordpress. If you are using a self-hosted installation of Wordpress you can find out what version you are using within your Wordpress Dashboard footer, and then check this against the latest download available from Wordpress.org.
If you are using Wordpress.com then you will always have the latest version they offer.
Have you tried both importing options?
If you have a huge archive of blog posts you are importing, this may trigger an error if your server runs out of memory trying to provide all of that content. If you get an error when you are importing via the Web you should try importing via an export file.