This message could mean two things:

- You didn't select a strategy

Select a strategy in your config. 

If you only want to trade on signals, you can select "No strategy, manual/external targets only". 

Your Hopper wil continu to display this message in the output, you can ignore this message.

- Your Hopper is waiting for a good moment to buy.

When searching for targets, it will display this message, so you know your Hopper is searching for a good moment to buy. Sometimes with backtested config pools, your thresholds in "Multiple TA Advanced settings"  are too high. Default them, and it will be easier for your Hopper to find a new target.