Can't Add rss url

[JasonLinkinBright]

`fun onSaveSourceClicked(url: String) = viewModelScope.launch(Dispatchers.IO) {
val trimmedUrl = url.trimIndent()
if (Patterns.WEB_URL.matcher(trimmedUrl.toLowerCase(Locale.US)).matches()) {
sourceErrText.postValue(R.string.empty_string)

        val cleanUrl = URLUtil.guessUrl(trimmedUrl)
        val alreadyExists = sourceRepo.isSourceExisting(cleanUrl)

        if (alreadyExists) {
            sourceErrText.postValue(R.string.error_source_exists)
        } else {
            isSourceProgressVisible.postValue(true)
            isSourceAddButtonEnabled.postValue(false)
            closeKeyboardEvent.postEvent(true)
            addSource(cleanUrl)
        }
    } else if (url.isEmpty()) {
        sourceErrText.postValue(R.string.error_empty_source_url)
    } else {
        sourceErrText.postValue(R.string.error_invalid_url)
    }
}`

I want to add rss ,but it appears to not work.