The SVN url has been changed by SourceForge. In your repository root, or in an individual module, run the command:
svn switch --relocate https://apertium.svn.sourceforge.net/svnroot/apertium/ https://svn.code.sf.net/p/apertium/svn/
Revision history of "Apertium-es-an"
From Apertium20 | 50 | 100 | 250 | 500)
Diff selection: mark the radio boxes of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with current revision, (prev) = difference with preceding revision, m = minor edit.