Understanding the Cannot read properties of null (reading 'getContext') Error in JavaScript

Understanding the Cannot read properties of null (reading 'getContext') Error in JavaScript

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JavaScript : Cannot read property 'getContext' of null, using canvas
JavaScript : Cannot read property 'getContext' of null, using canvas
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JavaScript : Cannot read property 'getContext' of null, using canvas

JavaScript : Cannot read property 'getContext' of null, using canvas
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Cannot read property 'start' of null
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