multiple dropdown

Hi, i can't tell you exact issue as i cant see whole code here and what values you are passing. But just make sure seleceted value should also exist in choice values array. try to debug the ui and see what's happening once you select anything from the drop down.

a!multipleDropdownField(
                disabled: if(
                  or(
                    not(
                      fv!item.category_txt = cons!CR_APP_SC_GENERAL_SPECIFIC_LAB_VAL[2]
                    ),
                    rule!CR_APP_FN_freezeRecords(
                      crAppSelectedItem_cdt: fv!item,
                      isDisplayed_bool: ri!isEditable_bool
                    )
                  ),
                  true(),
                  false()
                ),
                placeholderLabel: cons!CR_APP_TXT_PLACEHOLDER_VALUE,
                choiceLabels: trim(
                  split(
                    local!facilityChoices.limitIdDescription_txt,
                    ";"
                  )
                ),
                choiceValues: trim(
                  split(
                    local!facilityChoices.limitIdDescription_txt,
                    ";"
                  )
                ),
                value: reject(
                  fn!isnull,
                  {
                    trim(
                      split(
                        fv!item.facility_txt,
                        ";"
                      )
                    )
                  }
                ),
                saveInto: a!save(
                  fv!item.facility_txt,
                  joinarray(
                    save!value,
                    ";"
                  )
                ),
                validations: if(
                  rule!CR_APP_FN_freezeRecords(
                    crAppSelectedItem_cdt: fv!item,
                    isDisplayed_bool: ri!isEditable_bool
                  ),
                  null,
                  rule!CR_FN_setMaximumCharactersValidation(
                    comments_txt: index(
                      fv!item,
                      "facility_txt",
                      {}
                    )
                  )
                ),
                required: if(
                  rule!CR_APP_FN_freezeRecords(
                    crAppSelectedItem_cdt: fv!item,
                    isDisplayed_bool: ri!isEditable_bool
                  ),
                  false(),
                  index(
                    fv!item,
                    "category_txt",
                    {}
                  ) = cons!CR_APP_SC_GENERAL_SPECIFIC_LAB_VAL[2]
                )
              )

a!multipleDropdownField(
                disabled: if(
                  or(
                    not(
                      fv!item.category_txt = cons!CR_APP_SC_GENERAL_SPECIFIC_LAB_VAL[2]
                    ),
                    rule!CR_APP_FN_freezeRecords(
                      crAppSelectedItem_cdt: fv!item,
                      isDisplayed_bool: ri!isEditable_bool
                    )
                  ),
                  true(),
                  false()
                ),
                placeholderLabel: cons!CR_APP_TXT_PLACEHOLDER_VALUE,
                choiceLabels: trim(
                  split(
                    local!facilityChoices.limitIdDescription_txt,
                    ";"
                  )
                ),
                choiceValues: trim(
                  split(
                    local!facilityChoices.limitIdDescription_txt,
                    ";"
                  )
                ),
                value: reject(
                  fn!isnull,
                  {
                    trim(
                      split(
                        fv!item.facility_txt,
                        ";"
                      )
                    )
                  }
                ),
                saveInto: a!save(
                  fv!item.facility_txt,
                  joinarray(
                    save!value,
                    ";"
                  )
                ),
                validations: if(
                  rule!CR_APP_FN_freezeRecords(
                    crAppSelectedItem_cdt: fv!item,
                    isDisplayed_bool: ri!isEditable_bool
                  ),
                  null,
                  rule!CR_FN_setMaximumCharactersValidation(
                    comments_txt: index(
                      fv!item,
                      "facility_txt",
                      {}
                    )
                  )
                ),
                required: if(
                  rule!CR_APP_FN_freezeRecords(
                    crAppSelectedItem_cdt: fv!item,
                    isDisplayed_bool: ri!isEditable_bool
                  ),
                  false(),
                  index(
                    fv!item,
                    "category_txt",
                    {}
                  ) = cons!CR_APP_SC_GENERAL_SPECIFIC_LAB_VAL[2]
                )
              )

Hi there,

According to the error, the choiceValues is null. 
Try printing the choice values on the screen to see if it has a valid set of values, in the desired format.