Random Error after Run Extract to xls

Hi everyone, trouble here when I try to export a dataset.
Sometimes the file is not created and in the left panel this error appears:

"The extract data job failed with the message: 
For input string: "2,9"
More information may be available in the log files."

This is the error message:

"06/04 17:01:15 [/usr/local/tomcat/webapps/OpenClinica/] FTP ERROR  o.a.o.j.XsltTransformJob:515 - Error executing extract 
 java.lang.NumberFormatException: For input string: "2,9"
        at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1222)
        at java.lang.Double.parseDouble(Double.java:510)
        at org.akaza.openclinica.job.XsltTransformJob.setFormat(XsltTransformJob.java:874)
        at org.akaza.openclinica.job.XsltTransformJob.executeInternal(XsltTransformJob.java:258)
        at org.akaza.openclinica.job.XsltStatefulJob.executeInternal(XsltStatefulJob.java:23)
        at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:223)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:549)"

Using tomcat 6, java 6 and OC 3.1.4.1
The OS is Ubuntu 12.04 i686 (same error in an EC2 amazon AMI)

Thanks in advance.

Mauro

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