Final answer:
The problem solver hits a blank wall and might want to give up during the incubation phase of the classic creative process, which allows for subconscious processing after initial brainstorming.
Step-by-step explanation:
In the classic creative process, the problem solver is likely to hit a blank wall and want to give up during the incubation phase. This is the stage where after immersing oneself in the problem and having initial brainstorming sessions to generate a variety of ideas, the individual steps back to let the subconscious work.
The problem solver might feel a mental block, commonly feeling stuck or unable to progress with conventional thinking, thus needing a break from active problem-solving. This step is crucial because it allows for subconscious processing which can lead to insights and novel ideas.