# Wowza Streaming Engine service 4.7.3 fails to start

**URL:** <https://community.wowza.com/t/wowza-streaming-engine-service-4-7-3-fails-to-start/50647>\
**Category:** Wowza Streaming Engine\
**Created:** [January 25, 2018, 6:05pm UTC](https://community.wowza.com/t/wowza-streaming-engine-service-4-7-3-fails-to-start/50647 "2018-01-25T18:05:39Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Daniel\_Tailby](https://avatars.discourse-cdn.com/v4/letter/d/6a8cbe/32.png) [@Daniel\_Tailby](https://community.wowza.com/u/Daniel_Tailby)\
**Post date:** [January 25, 2018, 6:05pm UTC](https://community.wowza.com/t/wowza-streaming-engine-service-4-7-3-fails-to-start/50647/1 "2018-01-25T18:05:39Z")

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Since upgrading the AMI to use 4.7.3 of Wowza Streaming Engine I am unable to launch the Engine service.

On deploy the engine fails to start, and when I try to launch the standalone mode I receive the following error:

```auto

Error starting: java.lang.reflect.InvocationTargetException java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at com.wowza.wms.bootstrap.Bootstrap.startServer(Bootstrap.java:650) at com.wowza.wms.bootstrap.Bootstrap.main(Bootstrap.java:67) Caused by: java.lang.NoSuchMethodError: com.wowza.util.Base64.insert(ILjava/lang/String;)Ljava/lang/String; at com.wowza.wms.transcoder.model.TranscoderContextServer.<init>(TranscoderContextServer.java:22) at com.wowza.wms.server.Server.<init>(Server.java:920) at com.wowza.wms.server.Server.getInstance(Server.java:1022) at com.wowza.wms.server.Server.start(Server.java:1071) ... 6 more

```

It suggests it is calling Base64.insert which is not a valid function. The docs don’t mention such a function either [https://www.wowza.com/resources/serverapi/com/wowza/util/Base64.html](https://www.wowza.com/resources/serverapi/com/wowza/util/Base64.html)

The Manager service starts, but I am unable to login because it cannot contact the Engine.

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**Author:** ![Jermaine\_Hemby](https://avatars.discourse-cdn.com/v4/letter/j/82dd89/32.png) [@Jermaine\_Hemby](https://community.wowza.com/u/Jermaine_Hemby)\
**Post date:** [January 27, 2018, 5:02pm UTC](https://community.wowza.com/t/wowza-streaming-engine-service-4-7-3-fails-to-start/50647/2 "2018-01-27T17:02:46Z")

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Hello,

Thanks for contacting the Wowza Community!

If you roll back the upgrade, does the fix the issue?

I suggest opening a ticket [HERE](https://www.wowza.com/support/open-ticket) and include your /conf and /manager and /log files. Can you make sure a Wowza restart is included in one of the latest log access files?

regards,  
Jermaine

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**Author:** ![Daniel\_Tailby](https://avatars.discourse-cdn.com/v4/letter/d/6a8cbe/32.png) [@Daniel\_Tailby](https://community.wowza.com/u/Daniel_Tailby)\
**Post date:** [January 29, 2018, 9:10am UTC](https://community.wowza.com/t/wowza-streaming-engine-service-4-7-3-fails-to-start/50647/3 "2018-01-29T09:10:06Z")

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Hi Jermaine,

That was my first thought, but I cannot find the AMI for 4.7.1 on the AWS marketplace anymore. 4.7.3 is the only version that appears.

4.7.1 - ami-fc21ca85

4.7.3 - ami-1499196d

Has it been removed and an upgrade enforced?

I have done that also, awaiting a reply on that.

Dan