Checkbox field error

Hi Marco Tacca 

The issue is because you are trying to save multiple values in a single field. If you want to select multiple values the value must be a type of array.

a!localVariables(
  local!data:{},
  a!checkboxField(
    label:"Skills",
    choiceLabels: {"C","C++",".net","java","appian"},
    choiceValues: {"C","C++",".net","java","appian"},
    value: local!data,
    saveInto: local!data
  )
)

Storing multiple values in one field is a dangerous design decision. If this is what you want/need, you can use something like this:

a!localVariables(
  local!boxValue,
  a!checkboxField(
    choiceLabels: {"Option 1", "Option 2"},
    choiceValues: {1, 2}, /* Integers here */
    label: "Checkboxes",
    labelPosition: "ABOVE",
    saveInto: a!save(
      target: local!boxValue,
      value: joinarray(a!defaultValue(save!value, {}), ";")
    ),
    value: if(
      a!isNullOrEmpty(local!boxValue),
      null,
      tointeger(split(local!boxValue, ";")) /* Integers here */
    ),
    validations: {}
  )
)

An alternative is, to store the values in JSON format using toJson() and fromJson().

Check if the value matches exactly with the choiceValues array options.

 Marco Tacca 

It seems that your record text type does not support multiple selections when using checkbox. To store multiple selected values, consider using a local variable, a rule with the 'AnyType' data type, or a map function