title: Flat buffers : Object serialization must not be nested
body: <pre><code>        FlatBufferBuilder fbb = new FlatBufferBuilder(1024);
  
          String directory = "/Users/samarnath/RmsOne/CreateFlatBuffer/src/com/rms/objects/resources";
          File [] policyfiles = ReturnFilesWithPattern(directory, "singlecoverriskpolicy");
  
          for (File file: policyfiles)
          {
  
              Long StructureId = 0L;
              int insurer = 0;
              int insured = 0;
              int UnderWriter = 0;
              int inception = 0;
              int Expiration = 0;
              int ExternalID = 0;
              Long SubjectId =0L;
              int SubjectName = 0;
              int SubjectStructureName = 0;
              int Share = 0;
              Double blanketLimit = 0.0;
              Double attachment = 0.0;
              int causeofLoss = 0;
              int maxDeductible = 0;
              int attachmentCurrency = 0;
              int offset= 0;
              int deductibleCurrencyOffset = 0;
              int createOffset =0;
              int blanketLimitCurrency = 0;
  
  
              String folderName = "nfs://dev-spark-share.lab.rmsonecloud.net/mnt/data/UserData/import/outputfiles/Job_5/SmokeTest_2M/eufl_only_client4_2_edm__20151203-134544__24/contract/";
              List&lt;String&gt; lines = Files.readAllLines(file.toPath());
              List&lt;String&gt; actualLines = lines.subList(1, lines.size());
  
              for (String line:actualLines)
              {
                  String [] riskitems = line.split("~");
  
                  SingleCoverRiskPolicy.startSingleCoverRiskPolicy(fbb);
                  Long Id  = Long.parseLong(riskitems[0]);
                  int policyName = fbb.createString(riskitems[1]);
  </code></pre>
  
  <p>After the above line i get an error saying Exception in thread "main" java.lang.AssertionError: FlatBuffers: object serialization must not be nested.I get an error in fbb.createString.</p>
  
  <p>The code is simple and i cant figure out whats wrong here</p>