"Interface Definition: Expression evaluation error at function 'union' parameter 2 [line 33]: "

Question

Hi, I have created a task report where multiple filters are required. One of the filter is like keeping a dropdown for list of tasks available and based on selection, only those tasks should be populated in the grid. Initially the grid is displaying all the Tasks. On choosing a value in the drop down, it throws a error "Interface Definition: Expression evaluation error at function 'union' parameter 2 [line 33]: " I have attached the code. Thanks in advance..... 
 Task Report.txt 
 OriginalPostID-126532 
 OriginalPostID-126532

venkats533 · Accepted Answer

union expects two arrays not two single values. local!values[1] is not correct, instead use local!values.data[1].value, in fact using index(local!values.data, "value") is even better and handles empty or null data elements.