[Resolved] Problem with «expression evaluation error»

[Gary_Widdison]

Hello

I am getting an «expression evaluation error» with a fairly simple expression but the logs don’t give me much info unfortunately, the expression is

Set variable $PoolHeaterEnergyFull value using expression:

$PoolHeaterEnergyFull + ($context.event.variable - $PoolHeaterEnergyPrevious)

All variables have values so I am guessing I have a syntax error of some sort?

Any help would be appreciated!

Thanks

Found answer, had “variable” instead of “value”!

[josh]

Thanks for the update and glad to hear you got it sorted out.

For future reference, the Expression editor has an autocomplete feature. When you start typing $ it will automatically prompt with a list of variables.

$

Expression Functions $. side-note (tap to expand)

Not necessarily directly related to your post, but the first item in the list is $. which is a special placeholder to pull up the list of common expression functions.

$context.

For the $context variable, once you select it from the list or type the trailing period as $context. it will bring up the next tier of Context Variable groupings:

$context.event.

And if you select $context.event. it will bring up the valid options available under that tier where you can select value :