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added sample config to improve readability of answer
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Bart Koopman
Bart Koopman
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You areseem to be missing one of the function sources. 

You should find a dll with thiswhich contains the function GetImageAlt and add it to the GAC. After, you need to add a reference to this dll into functionSourcesthe functionSources section of your Tridion.ContentMananger.configTridion.ContentMananger.config. See an example snippet of the Tridion.ContentMananger.config below:

<tridion.templating>
  <functionSources>
    <functionSource type="Tridion.ContentManager.Templating.Expression.BuiltInFunctions" />
    <functionSource type="MyCustomClass" assembly="MyCustomClass, Version=1.0.0.0, Culture=neutral, PublicKeyToken=ddfc8957d6e5ee6b" />
  </functionSources>
</tridion.templating>

You are missing one of the function sources. You should find a dll with this function and add it to the GAC. After, you need to add reference to this dll into functionSources section of your Tridion.ContentMananger.config.

You seem to be missing one of the function sources. 

You should find a dll which contains the function GetImageAlt and add it to the GAC. After, you need to add a reference to this dll into the functionSources section of your Tridion.ContentMananger.config. See an example snippet of the Tridion.ContentMananger.config below:

<tridion.templating>
  <functionSources>
    <functionSource type="Tridion.ContentManager.Templating.Expression.BuiltInFunctions" />
    <functionSource type="MyCustomClass" assembly="MyCustomClass, Version=1.0.0.0, Culture=neutral, PublicKeyToken=ddfc8957d6e5ee6b" />
  </functionSources>
</tridion.templating>
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Andrey Marchuk
Andrey Marchuk
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You are missing one of the function sources. You should find a dll with this function and add it to the GAC. After, you need to add reference to this dll into functionSources section of your Tridion.ContentMananger.config.