# LightMeter Magic Number not Working!

**URL:** <https://forum.commonvisionblox.com/t/lightmeter-magic-number-not-working/500>\
**Category:** General Questions\
**Tags:** lightmeter, magicnumber\
**Created:** [July 30, 2018, 8:54am UTC](https://forum.commonvisionblox.com/t/lightmeter-magic-number-not-working/500 "2018-07-30T08:54:05Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![taserface](https://avatars.discourse-cdn.com/v4/letter/t/22d042/32.png) [@taserface](https://forum.commonvisionblox.com/u/taserface)\
**Post date:** [July 30, 2018, 8:54am UTC](https://forum.commonvisionblox.com/t/lightmeter-magic-number-not-working/500/1 "2018-07-30T08:54:05Z")

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I recently received a CVB dongle (serial number 50018) with a LightMeter Magic Number that I added through the Management Console. But still, whenever I start a LightMeter tutorial I get a message box telling me that no LightMeter License was found?!?

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**Author:** ![illusive](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/illusive/32/61_2.png) [@illusive](https://forum.commonvisionblox.com/u/illusive)\
**Post date:** [July 30, 2018, 9:50am UTC](https://forum.commonvisionblox.com/t/lightmeter-magic-number-not-working/500/2 "2018-07-30T09:50:12Z")

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What version of CVB are you using? LightMeter has no longer been available as a separate tool since after :cvb: 10.2. If you are in fact using 10.2 - what type of dongle did you receive? One of the Wibu CodeMeters (either a silver plastic stick or a red compact stick) or a Gemalto/SafeNet key? (I think these are purple at the moment)

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**Author:** ![taserface](https://avatars.discourse-cdn.com/v4/letter/t/22d042/32.png) [@taserface](https://forum.commonvisionblox.com/u/taserface)\
**Post date:** [July 30, 2018, 9:58am UTC](https://forum.commonvisionblox.com/t/lightmeter-magic-number-not-working/500/3 "2018-07-30T09:58:58Z")

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I am using version 10.2. The dongle I received is a short purple plastic thingy which reads “Sentinel” on the back:  
 ![IMG_20180730_115253](https://cdck-file-uploads-canada1.s3.dualstack.ca-central-1.amazonaws.com/flex027/uploads/commonvisionblox/original/1X/9da1fa0d203132c7f4c11d850cfa13437a9404e4.jpg)

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**Author:** ![illusive](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.commonvisionblox.com/illusive/32/61_2.png) [@illusive](https://forum.commonvisionblox.com/u/illusive)\
**Post date:** [July 30, 2018, 11:37am UTC](https://forum.commonvisionblox.com/t/lightmeter-magic-number-not-working/500/4 "2018-07-30T11:37:02Z")

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Ok. “Sentinel” is just the name of the product line (which evolved from “Rainbow Sentinel”). So this is the type of dongles shipped with :cvb: prior to version 11.0 (a.k.a. 2011) and will still be shipped by default if you order a :cvb: 10 license. And in that case the LightMeter Magic Number also makes sense because up until version 10.2 LightMeter was still sold separately.

In September 2011 a problem was discovered and fixed that concerns LightMeter Magic Numbers for :cvb: serial numbers \>= 50000. As this was at a stage where no more :cvb: 10.2 updates were published this fix never made it into a proper setup, but it is easy enough to apply: Simply copy the DLL from this archive [[Lightmeter.zip](https://forum.commonvisionblox.com/uploads/commonvisionblox/original/1X/93d5530f16f179974d0f094aa0b23bbd5faf10c6.zip) (176.7 KB)] into your _%CVB%_ directory, then I would expect the tool to accept the Magic Number you received. If this is not the case, please contact Stemmer Imaging’s or your local distributor’s support.