elisp call dot babel doesn't work on Org mode 9

elisp call dot babel doesn't work on Org mode 9

[wang jinjian]

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Hi,

I like generating simple process diagrams using dot and tables
<http://orgmode.org/worg/org-tutorials/org-dot-diagrams.html> tutorial!
It works fine on Org mode 8 but doesn't work on Org mode 9.0.5.

The reason is the params variable not accessible! below error message
displayed:

let: Symbol’s value as variable is void: params

What's the right steps to run dot code in elisp code block in Org mode 9?

BRs
J.J. Wang

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