Exception thrown on formSingleSelect macro freemarker. - spring-mvc

I have this spring macro
[#spring.formSingleSelect path="discoveryProjectDetailsBean.discoveryProjectBean.dataSource" options="dataSources" /]
it throws exception
freemarker.template.TemplateException: Expected collection or sequence. options evaluated instead to freemarker.template.SimpleScalar on line 227, column 20 in spring.ftl.
at freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:135)
this happens because it cannot interpret the dataSource list as sequence.
any help

now I never found harder question that this, this exception above happened as the dataSource list I was trying to set as options list wasn't pure string list. all the options list to be passed to the #spring.formSingleSelect I also found another reference here
with a case just like mine code snippet of the working tag I am using now is below.
[#spring.bind "dataSources"/]
[#spring.formSingleSelect "discoveryProjectDetailsBean.discoveryProjectBean.dataSource" dataSources "disabled='disabled' multiple='multiple' class='singleList' onchange='checkValidations()'" /]
I hope this would help somebody

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