HTML5 Canvas Cannot set property 'y' of undefined?

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The instance is very clearly defined:

External JS file:

This has never been an issue before, any idea what the problem could be now?

Thanks.

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ClayUUIDCorrect answer

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First step of debugging, always: Confirm your assumptions.

You assume exportRoot.Mark exists. You assume exportRoot.APDHMIDM exists. Confirm this is true. Stick some console.log() statements in there that display them.

C

ClayUUIDCorrect answer

Legend

First step of debugging, always: Confirm your assumptions.

You assume exportRoot.Mark exists. You assume exportRoot.APDHMIDM exists. Confirm this is true. Stick some console.log() statements in there that display them.

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jeffery wrightAuthor

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Thanks for that!

It turns out that exportRoot.Mark was mis-Instance named as b_Mark which was the problem.

Looking at the line in question I assumed the issue was APDHMIDM since I would surely never make such a stupid mistake as not naming my button selection marker correctly... which is exactly what happened.

I appreciate your help, thanks man!

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