**This article applies to environments that use PostgreSQL with .NET Core 1.0.9 or later.** ## Answer Install the extension module postgresql12-contrib. --- ## Overview When you perform a cross-search in the upper right corner of the Pleasanter screen "There was a problem with the application." If the above error message appears and the program does not run correctly, the extension module may not be installed correctly. Please follow the steps below. ## Operation Procedure 1. Install the extension module postgresql12-contrib ``` sudo yum -y install postgresql12-contrib ``` 1. Connect to the DB "Implem.Pleasanter" and execute the following SQL. ``` CREATE EXTENSION pg_trgm; ```