error while running pdfstockcheckcomparisons.php

[newuser990]

After entering the stock counts, when I tried to run the pdfstockcheckcomparison.php with the option selected to make adjustments as necessary, I got the following error message :

" ERROR Message Report : The date does not appear to be in a valid format. The date being converted from SQL format was:
TCPDF ERROR: Some data has already been output, can't send PDF file "

I tried it 3 times and got the same error message.
However the stockcounts are being entered with adjustments but the stock check counts is not getting reset to zero and all the counts that I had entered remain as it is.