Fix logging statement

[logresearch]

Description:

This is an incremental change for the logging statement.
This PR updates the logging statement within the generateSubscriptionPDF function to improve clarity. The new logging statement provides a more straightforward description of the error.

Changes:

1. Updated Logging Statement:
   • Changed the logging statement from:

     log.warn("was not able to generate subscription pdf for " + subscription.getId(), e);

     to:

     log.warn("Failed to generate subscription pdf for " + subscription.getId(), e);

same as the other two code change.