The first histogram under section 3.1 comes up when the chapter-3 script is loaded initially. But when I try to rerun it manually after data setup, the histogram dont come up. Getting blank graph instead. Attaching screenshot for your reference. Let me know what am i missing. Thanks in advance.

The first histogram under section 3.1 comes up when the chapter-3 script is loaded initially. But when I try to rerun it manually after data setup, the histogram dont come up. Getting blank graph instead. Attaching screenshot for your reference. Let me know what am i missing. Thanks in advance.
