Problem with updating a mobile sql database

This is strange. Cause earlier I could update the mobile sql server with no problem, but now I am getting this parsing error

it says Token line number = 1, ....

The windows mobile emulator works, but not in the actual pda.

The sql query is following
sql2 = "update flexi_pump set difference = " + divergence + " where tag = '" + tag + "'";

selecting data from the database works fine, no problem with it. only writing to it is the problem I would recommend using command parameters to avoid occasional string concatenation mishaps and possible SQL injection attacks on your code. If the tag variable is a string, it may contain a quote and it will break the syntax.