# OpenCISC serious error

**URL:** <https://forum.certara.com/t/opencisc-serious-error/727>\
**Category:** Troubleshooting and Problems\
**Created:** [February 4, 2015, 5:44pm UTC](https://forum.certara.com/t/opencisc-serious-error/727 "2015-02-04T17:44:15Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Sergiy](https://sea1.discourse-cdn.com/certara/user_avatar/forum.certara.com/sergiy/32/2553_2.png) [@Sergiy](https://forum.certara.com/u/Sergiy)\
**Post date:** [February 4, 2015, 6:43pm UTC](https://forum.certara.com/t/opencisc-serious-error/727/1 "2015-02-04T18:43:34Z")

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Hi Paula,

Try to increase your computer memory dedicated to validation process. In your old version 1.5 you need to edit “client.bat” file changing “Xmx1024m” value which represents 1GB maximum used memory. For example, the following settings expand this value to 2GB:

**START /B javaw -Xms256m -Xmx2048m -jar lib/validator-gui-1.5.jar**

Kind Regards,

Sergiy

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<div class="post-metadata">

**Author:** ![PDL](https://avatars.discourse-cdn.com/v4/letter/p/49beb7/32.png) [@PDL](https://forum.certara.com/u/PDL)\
**Post date:** [February 4, 2015, 5:44pm UTC](https://forum.certara.com/t/opencisc-serious-error/727/2 "2015-02-04T17:44:15Z")

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I am getting this error when running OpenCDISC. Any suggestions?:

--------- System Information ---------

Version: 1.5

JRE: 1.6.0\_24

OS: Windows Server 2008 R2 6.1 x86

* * *

java.lang.OutOfMemoryError: Java heap space

at java.util.Arrays.copyOf(Unknown Source)

at sun.misc.Resource.getBytes(Unknown Source)

at java.net.URLClassLoader.defineClass(Unknown Source)

at java.net.URLClassLoader.access$000(Unknown Source)

at java.net.URLClassLoader$1.run(Unknown Source)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)

at java.lang.ClassLoader.loadClass(Unknown Source)

at org.apache.poi.hssf.usermodel.HSSFWorkbook.createSheet(HSSFWorkbook.java:787)

at org.opencdisc.validator.report.ExcelReporter.close(ExcelReporter.java:162)

at org.opencdisc.validator.DefaultValidator.validate(DefaultValidator.java:446)

at org.opencdisc.validator.gui.ValidatorClient$ProcessMonitor.run(ValidatorClient.java:1418)