- fixed variable name

src/usr/local/bin/validate_workflow.sh

@@ -325,7 +325,7 @@ get_cli_args() {
             || [[ -n "${VALID_FOLDER}" ]] \
             || [[ -n "${INVALID_FOLDER}" ]] \
             || [[ "${FILES_MODE}" = "sort" ]] \
-            || [[ "${SINGLE_FILE}" -eq 1 ]] \
+            || [[ "${WITH_SINGLE_FILE}" -eq 1 ]] \
             ; then 
             error "param --pipe not combinable with params --daemon, --result-folder, --watch-folder, --valid-folder, --invalid-folder, --files-mode"
             exit 1