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tasklist/docscan/src/org/netbeans/modules/tasklist/docscan/Cache.java says String loc = System.getProperty("netbeans.user") + File.separatorChar + "cache" + File.separatorChar + "all-todos.ser"; $userdir/cache/ is now $userdir/var/cache/ so please update this.
*** Issue 43591 has been marked as a duplicate of this issue. ***
fixed.