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copied!<p>SVN keeps pristine copies of all the files you checkout buried in the .svn directories. This is called the text-base. This allows for speedy diffs and reverts. During various operations, SVN will do checksums on these text-base files to catch file corruption issues.</p> <p>In general, an SVN checksum mismatch means a file that shouldn't have been altered was changed somehow. What does that mean?</p> <ol> <li>Disk corruption (bad HDD or IDE cable)</li> <li>Bad RAM</li> <li>Bad network link</li> <li>Some kind of background process altered a file behind your back (malware)</li> </ol> <p>All of these are bad.</p> <p><strong>HOWEVER</strong>, I think your problem is different. Look at the error message. Note that it expected some MD5 hashes, but instead got back 'null'. If this were a simple file corruption issue, I would expect that you would have two different MD5 hashes for the expected/got. The fact that you have a 'null' implies that something else is wrong.</p> <p>I have two theories:</p> <ol> <li>Bug in SVN.</li> <li>Something had an exclusive lock on the file, and the MD5 couldn't happen.</li> </ol> <p>In the case of #1, try upgrading to the latest SVN version. Maybe also post this on the svn-devel mailing list (<a href="http://svn.haxx.se" rel="noreferrer">http://svn.haxx.se</a>), so the developers can see it.</p> <p>In the case of #2, check to see if anything has the file locked. You can download a copy of Process Explorer to check. Note that you probably want to see who has a lock on the <strong>text-base</strong> file, not the actual file you were trying to commit.</p>

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