Biml / Mist cryptic errors demystified

Error:: BimlScript expected X properties, but Y were supplied Provide required properties

The required attribute on parameter object does not seem to work when using CallBimlScript
example: 
<#@ property name="parameterValue" type="System.String" required="False"#>

Workaround: Specify empty/null parameter in CallBimlScript then use string.IsNullOrEmpty(parameterValue) in your callee script.


Error

When building biml script i get
"Error:Node: Varigence.Biml.SsisEmitter.Model.Dataflow.Input: Expression  contains syntax errors" 
No error lines or task names are shown.

Cause  / Solution

This message actually means that one of your tasks have an empty ssis expression (Note the double space between "Expression  contains". Examples could be columns inside a . Check recent added tasks for missing expressions.

Error

Cannot build biml file in mist that has an ssis expression containing double ampersands "&&"

Cause / Solution

The xml format bilm is using cannot handle ampersands (&) since they are special xml characters. Replace them with &amp; like below:

Does not work:
!isnull(DestinationKey) && (DT_STR,40,1252)DataRowHash == (DT_STR,40,1252)DestinationDataRowHash

Working:
!isnull(DestinationKey) &amp;&amp; (DT_STR,40,1252)DataRowHash == (DT_STR,40,1252)DestinationDataRowHash


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