# Open vidu call Internel servor error

**URL:** <https://openvidu.discourse.group/t/open-vidu-call-internel-servor-error/4530>\
**Category:** Issues developing apps\
**Tags:** v2\
**Created:** [April 5, 2023, 8:34pm UTC](https://openvidu.discourse.group/t/open-vidu-call-internel-servor-error/4530 "2023-04-05T20:34:05Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Malak\_Moussa](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/malak_moussa/32/2196_2.png) [@Malak\_Moussa](https://openvidu.discourse.group/u/Malak_Moussa)\
**Post date:** [April 5, 2023, 8:34pm UTC](https://openvidu.discourse.group/t/open-vidu-call-internel-servor-error/4530/1 "2023-04-05T20:34:05Z")

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hello , when i try to connect to a session ( open-vidu call java) Internel servor error :

2023-04-05 21:26:38.017 ERROR 16816 — [nio-5000-exec-4] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause

java.lang.NullPointerException: null  
at io.openvidu.call.java.services.OpenViduService.createConnection(OpenViduService.java:164) ~[classes/:na]  
at io.openvidu.call.java.controllers.SessionController.createConnection(SessionController.java:78) ~[classes/:na]  
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]  
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]  
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]  
at java.base/java.lang.reflect.Method.invoke(Method.java:566) ~[na:na]

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**Author:** ![pabloFuente](https://yyz2.discourse-cdn.com/free1/user_avatar/openvidu.discourse.group/pablofuente/32/2536_2.png) [@pabloFuente](https://openvidu.discourse.group/u/pabloFuente)\
**Post date:** [April 10, 2023, 9:51am UTC](https://openvidu.discourse.group/t/open-vidu-call-internel-servor-error/4530/2 "2023-04-10T09:51:47Z")

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Make sure you use the same version number in your OpenVidu deployment and your openvidu-java-client SDK dependency.