<p>This one has me scratching my head.</p>

<p>I'm running Subversion 1.3.1 (r19032) on Ubuntu. All was well until recently when I tried to run svnadmin verify prior to a dump. This is the error message:</p>

<blockquote>
  <p>svnadmin: Invalid diff stream: insn 0
  cannot be decoded</p>
</blockquote>

<p>I have looked around for an explanation and fix but can't seem to find one. Subversion experts, I need your help.</p>

You should ensure that you are using the correct version of
```
svnadmin
```
for your repository version. It's possible to get errors like this by using the wrong version.
Having said that, version 1.3.x is pretty old now and you should consider upgrading to the latest 1.5.x.
I also found through google that
some versions of SVNKit
can cause this problem.