Setting the string value of 'myTerm' based on various cell content combinations

Is it possible to set the value of myTerm using a series of If statements?

I have 3 columns in a worksheet which will have data added to them over the course of the year.

I have the following scenarios:

K has data and M & O = "Autumn"
K and M have data and O is empty = "Spring"
K, M and O all have data = Summer

I have written the following (a snippet of the full code):

Sub FilterProgressData()

    Dim myTerm As String

    If SrcWs.Cells(i, "O").Value = "" And SrcWs.Cells(i, "M").Value = "" And _
        SrcWs.Cells(i, "K").Value <> "" Then
            myTerm = "Autumn"

    ElseIf SrcWs.Cells(i, "O").Value = "" And SrcWs.Cells(i, "M").Value <> "" _
        And SrcWs.Cells(i, "K").Value <> "" Then
            myTerm = "Spring"

    ElseIf SrcWs.Cells(i, "O").Value <> "" And SrcWs.Cells(i, "M").Value <> "" _
        And SrcWs.Cells(i, "K").Value <> "" Then
            myTerm = "Summer"

but get a 'Run-time error '1004' error - Application-defined or object-defined error'

Any advice will be gratefully received!

Thanks.