The "Sum" operator is not supported by this connector

[TiredOldCoder]

What is wrong with this expression that I get subject error?

ClearCollect(
    fillVsVacant,
    {
        Category: "Filled",
        Count: Sum(
            Projects,
            'Billable Positions'
        )
    },
    {
        Category: "Vacant",
        Count: Sum(
            Projects,
            'Vacant Positions'
        )
    }
)

v/r,

Bill

[RandyHayes]

@TiredOldCoder 

What kind of columns are the Billable and Vacant positions defined as?  And what is your data source?

If they turn out to be text instead of numeric, you could consider using the following:

ClearCollect(
    fillVsVacant,
    {
        Category: "Filled",
        Count: Sum(Projects,  Value('Billable Positions'))
    },
    {
        Category: "Vacant",
        Count: Sum(Projects, Value('Vacant Positions'))
    }
)

I hope this is helpful for you.

[TiredOldCoder]

@RandyHayes,

I've Googled this message and came up with ZIP!

Both fields are numbers in a list (not a document library):

Title	Single line of text
Prime Manager	Lookup
Alt Manager	Lookup
Billable Positions	Number
Vacant Positions	Number
Job Postings	Number
Modified	Date and Time
Created	Date and Time
Created By	Person or Group
Modified By	Person or Group

[RandyHayes]

@TiredOldCoder 

All looks good! 

So, I would next start to suspect the environment...here's what I'd do next:

1) Save and close the app designer.  Then go back in to edit.  Many strange things are cleared up by this.

2) Remove the Projects datasource from your app...then add it back in.

3) Create a fresh app and add the Projects data source and a button with this exact syntax in the OnSelect.

Hopefully #1 will help and the others not needed, but if not, then walk down the list.

[TiredOldCoder · Accepted solution]

@RandyHayesnot sure why, but when I moved the code to the app OnStart() it worked.  Bug or Feature?