Have tried rebooting your iPhone? To do this, you have to completely turn the iPhone off and the turn it back on.
Turn iPhone completely off:
Press and hold Sleep/Wake button for a few seconds until the red slider appears, then drag the slider. When iPhone is off, incoming calls go straight to voicemail.
Turn iPhone on:
Press and hold the Sleep/Wake button until the Apple logo appears.
If that doesn't work, I would try deleting the app, reboot the iPhone, reinstall the app, followed by another reboot just to make things as fresh and pristine as possible.
I don't know if this work around is still necessary, but here is how I finally got Ward Tools to work on my iPhone:
Just to make them easier to find, move the exported .csv files into the same folder as the MLS Converter and Ward Tools Updater utilities.
Using a simple text editor, not a word processor, open the Membership.csv file. In the first line it has "Ward Geo Code" and "Stake Geo Code." Change the "Geo" in each of these to "GEO" (i.e. all caps) and then save the file.
(I used the TextEdit.app on the Mac to do this. If you use NotePad or WordPad in Windows to do this, make sure it gets saved as a .csv file and not a .txt or some other type of file.)
Open the MLS Converter app and point it (using the Browse button) at the Membership.csv file you just edited. The converter should now be able to convert the files.
After converting the .csv files, run the Ward Tools Updater app, and follow its instructions to upload the newly created .pdb files to your iPhone.