User Interface Error with one of our interfaces.

This only happens to one interface. Whenever you try to click on anything in design mode or edit anything in expression mode you get the above image. This is my expression mode code:

a!localVariables(
  local!selection:0,
  local!priority,
  local!search,
  local!date,
  {
    choose(
      local!selection+1,
      {
        a!richTextDisplayField(
          labelPosition: "COLLAPSED",
          value: {
            char(10),
            char(10),
            a!richTextItem(
              text: {
                "What do you need?"
              },
              color: "ACCENT",
              size: "LARGE"
            ),
            char(10),
            char(10)
          },
          align: "CENTER"
        ),
        a!columnsLayout(
          columns:{
            a!columnLayout(),
            a!columnLayout(
              contents: {
                a!cardLayout(
                  contents: {
                    a!richTextDisplayField(
                      labelPosition: "COLLAPSED",
                      value: {
                        char(10),
                        char(10),
                        char(10),
                        char(10),
                        char(10),
                        a!richTextItem(
                          text: {
                            "Create an SFN Order"
                          },
                          color: "ACCENT",
                          size: "LARGE",
                          style: {
                            "STRONG"
                          }
                        ),
                        char(10),
                        char(10),
                        a!richTextItem(
                          text: {
                            "Enter a new order into the system"
                          },
                          size: "SMALL"
                        )
                      },
                      align: "CENTER"
                    )
                  },
                  link: a!startProcessLink(
                    processModel: cons!MAP_PM_CREATE_ORDER
                  ),
                  height: "MEDIUM"
                )
              },
              width: "MEDIUM"
            ),
            a!columnLayout(
              contents: {
                a!cardLayout(
                  contents: {
                    a!richTextDisplayField(
                      labelPosition: "COLLAPSED",
                      value: {
                        char(10),
                        char(10),
                        char(10),
                        char(10),
                        char(10),
                        a!richTextItem(
                          text: {
                            "Create an SFNS Order"
                          },
                          color: "ACCENT",
                          size: "LARGE",
                          style: {
                            "STRONG"
                          }
                        ),
                        char(10),
                        char(10),
                        a!richTextItem(
                          text: {
                            "Enter a new order for SFNS into the system"
                          },
                          size: "SMALL"
                        )
                      },
                      align: "CENTER"
                    )
                  },
                  link: a!startProcessLink(
                    processModel: cons!SFNS_PROCESS_MODEL
                  ),
                  height: "MEDIUM"
                )
              },
              width: "MEDIUM"
            ),
            a!columnLayout(
              contents: {
                a!cardLayout(
                  contents: {
                    a!richTextDisplayField(
                      labelPosition: "COLLAPSED",
                      value: {
                        char(10),
                        char(10),
                        char(10),
                        char(10),
                        char(10),
                        a!richTextItem(
                          text: {
                            "Create an SFNG Order"
                          },
                          color: "ACCENT",
                          size: "LARGE",
                          style: {
                            "STRONG"
                          }
                        ),
                        char(10),
                        char(10),
                        a!richTextItem(
                          text: {
                            "Enter a new order for SFNG into the system"
                          },
                          size: "SMALL"
                        )
                      },
                      align: "CENTER"
                    )
                  },
                  link: a!startProcessLink(),
                  height: "MEDIUM"
                )
              },
              width: "MEDIUM"
            ),
            a!columnLayout()

          }
        )
      },
      {
        a!richTextDisplayField(
          value:a!richTextItem(
            text:{
              a!richTextIcon(icon:"arrow-left"),
              " Go Back"
            },
            link:a!dynamicLink(value:0,saveInto: local!selection)
          )
        ),
        rule!MAP_ordersGrid(
          priority: local!priority,
          search: local!search,
          date: local!date
        )
      },
      {
        a!richTextDisplayField(
          value:a!richTextItem(
            text:{
              a!richTextIcon(icon:"arrow-left"),
              " Go Back"
            },
            link:a!dynamicLink(value:0,saveInto: local!selection)
          )
        ),
        rule!TKV_MyTasks(batchSize: 10)
      }
    )
  }
)

Please help us this is a huge blocker for our team currently. 

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