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<div>What is the cause of this problem?</div><div><br></div><div>[ERROR]
Uncaught exception; exceptionName="Error" exceptionMessage="Cannot
modify old revisions" exceptionStack="Error: Cannot modify old
revisions\n at VersionedMap.set (lib/versioned-map.js:120:17)\<wbr>n at lib/session.js:117:44\n at lib/db.js:545:16\n at handleCallback (node_modules/mongodb/lib/util<wbr>s.js:120:56)\n at node_modules/mongodb/lib/colle<wbr>ction.js:1416:5\n at handleCallback (node_modules/mongodb/lib/util<wbr>s.js:120:56)\n at node_modules/mongodb/lib/curso<wbr>r.js:683:5\n at handleCallback (node_modules/mongodb-core/lib<wbr>/cursor.js:171:5)\n at nextFunction (node_modules/mongodb-core/lib<wbr>/cursor.js:691:5)\n at node_modules/mongodb-core/lib/<wbr>cursor.js:602:7"</div>
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