can't add script source, example from Wiki Improved Netwatch

RouterOS Scripting
1

Hi to all.
I’m trying to use part of code from example “Improved Netwatch” from Wiki in my script.
The script I’m trying to add is: system script add name=“test2” source=“:local i 0; {:do {:set i ($i + 1)} while i<5) && ([/ping 192.168.61.2 interval=3 count=1]=1)}”
Every time I’m trying this to add I’ve got the error: invalid argument name
I’m new to scripting and just learning so I can’t understand what’s wrong with this code. Can somebody help me with this?
Router os 2.9.51

2

add source=“:local i 0; {:do {:set i ($i + 1)} while i<5) && ([/ping 192.168.61.2 interval=3 count=1]=1)}”

3

Thank you a lot.