Macro issue: Object variable or with block variable not set error

[utgjmb1]

I'm trying to populate a matrix from three columns in a worksheet. My code is supposed to find a value in the first column, match it to the y-axis, then search the second column for a value, match it to a column header in the x-axis, and then paste the value from the third column in the cell activated by the row/column match. Does anyone see what's wrong with my code? I keep getting a "object variable or with block variable not set" error:

[xladept]

Can you post a sample sheet - and specify: originalString,aString,bString????