Try:
1. selecting cells B5:B9 and utilizing the clear > clear all feature
2. make sure that the format of cells B5:B9 is general
3. modify the formula from post #2 to include single quotes around the '[workbook]sheet'! i.e.
Formula: copy to clipboard 
=INDEX('[DB1.xlsx]Blad1'!D$2:D$6,MATCH(A5+0,INDEX('[DB1.xlsx]Blad1'!$E$2:$E$6+0,),0))

Let us know if you have any questions.