replacing file name with spaces in ibm aix.

I am using the following code  for renaming file name with white spaces to '_': -

find . -type f -name "* *.csv" -exec bash -c 'mv "$0" "${0// /_}"' {} \;

I am getting the following error: -

find: 0652-083 Cannot execute bash:: A file or directory in the path name does not exist.


please help.

Thanks in advance