# URSim 5.0 Error - Post Man Error

**URL:** <https://forum.universal-robots.com/t/ursim-5-0-error-post-man-error/2162>\
**Category:** URCaps SDK\
**Created:** [June 21, 2018, 7:56pm UTC](https://forum.universal-robots.com/t/ursim-5-0-error-post-man-error/2162 "2018-06-21T19:56:50Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![roman.reiner](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/roman.reiner/32/1294_2.png) [@roman.reiner](https://forum.universal-robots.com/u/roman.reiner)\
**Post date:** [June 21, 2018, 7:56pm UTC](https://forum.universal-robots.com/t/ursim-5-0-error-post-man-error/2162/1 "2018-06-21T19:56:51Z")

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Getting this error when running the latest starter package with the new URSim 5.0 offline simulator.

 ![image](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/1X/4ddf49adb63e49a619cab0e4be0cd7b7d6a9e0a1.png)

Causes the UI to go slow and then unresponsive.

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**Author:** ![jbm](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/jbm/32/614_2.png) [@jbm](https://forum.universal-robots.com/u/jbm)\
**Post date:** [June 22, 2018, 5:18am UTC](https://forum.universal-robots.com/t/ursim-5-0-error-post-man-error/2162/2 "2018-06-22T05:18:57Z")

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You may need to assign some more RAM to the VM, if you are having these messages frequently.

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**Author:** ![al.youngwerth](https://avatars.discourse-cdn.com/v4/letter/a/e19adc/32.png) [@al.youngwerth](https://forum.universal-robots.com/u/al.youngwerth)\
**Post date:** [January 8, 2019, 9:58pm UTC](https://forum.universal-robots.com/t/ursim-5-0-error-post-man-error/2162/4 "2019-01-08T21:58:42Z")

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Still having the issue with 4096MB of memory supplied to the VM.

Problem isn’t gone, but was significantly exacerbated with TimeUnit.SECONDS.sleep(1) call in my OpenView()