How to use MethodByName between different packages [closed]

i am using MethodByName in my go code to take the name of the function from config file, here i have declared the interface struct in other package but i want to call the function in other function,

                            log.Infof("\n name of metric is : " + metric.Name + "\n")
                            results := utils.Invoke(c, metric.Name, m, serviceLog, metric.TimeOut)
                            if !results[0].IsNil() {
                                log.Errorf("Failed to get " + metric.Name)
                            }

location of this file is /src/file1

func Invoke(any interface{}, name string, args ...interface{}) []reflect.Value {
    inputs := make([]reflect.Value, len(args))
    for i, _ := range args {
        inputs[i] = reflect.ValueOf(args[i])
    }
    result := reflect.ValueOf(any).MethodByName(name).Call(inputs)
    return result
}

this is in src/utils/file2

package diagnosticDumps

type ThresholdFunc struct{}

this is in src/diagnosticDumps

but it is giving panic: reflect: call of reflect.Value.Call on zero Value

the function written is exported

func (t *ThresholdFunc) HotThreadMetric(some parameters) {