[SonarQube] ERROR: Unable to create symbol table for : X.java

Hi, I am working on SonarQube 5.2 with Java 1.7 for a very massive project (more than 2 million lines of code). Specific versions as the rulesets are defined as per these specifications.
While trying to inspect the project for vulnerabilities, i am getting this error for all the java files in my project.
DEBUG: ----- Classpath analyzed by Squid:
DEBUG: -----
"ERROR: Unable to create symbol table for : <X.java>"
The process ends in success, but i am not getting any errors other than duplicate code, although i know there are multiple of them which can be verified manually.

Need help to ensure the rules are working fine on all the files and to get rid of this error.

Hi, SonarQube 5.2 is a very old version and is not supported anymore.

Your best course of action is first to upgrade to latest SonarQube (8.1 at time of writing) or at the very least to the latest LTS (7.9.2) which will include latest sonarjava analyzers which is likely to have this problem fixed. Everything is available here : https://www.sonarqube.org/downloads/