Error Accessing MS Access Database in Script Run from Command Prompt

I created a User Data Source named Reduction in the ODBC Source Administrator using a Microsoft Access Driver (*.mdb, *.accdb) for a MS Access Database. Interactively in Matlab, I can successfully run the following without error:

conn = database('Reduction','','');
setdbprefs('DataReturnFormat','cellarray');
disp(qry);
rslts = fetch(conn,qry);

However, when I run a script containing those commands using the following at acommand prompt:

matlab -nodesktop -nosplash -r "run O:\run_spectra_plot_by_ms_access.m"

I get the error

??? Error using ==> database.fetch at 23
[Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application Please verify 
that login information and database url are valid.

Error in ==> run_spectra_plot_by_ms_access at 7
  rslts = fetch(conn,qry);

Why am I getting that error and how can I resolve it?

[Jim]

Could this problem be due to a conflict of using drivers inconsistent with the Matlab application and the MS Access database?

[Walter Roberson]

Could you verify that the version of MATLAB that you are getting when you run interactively is the same one that you get when you invoke matlab from the command line?

[Jim]

I just "discovered" (I had forgotten and re-discovered the two versions installed) that my machine has both the 32 and 64 bit versions of Matlab installed. Running matlab at the command prompt was running the 64 bit version. I modified the command by qualifying it to point the 32 bit version and the script ran normally. Yay. That was so frustrating.