https://community.blueprism.com/t5/Product-Forum/Unable-to-import-external-Library-files-dll/m-p/65912#M18517 Close and reopen blueprism after using your external dll. Because blueprism loads dll at the start of the application. Tue, 12 Sep 2017 12:17:00 GMT RajeshS 2017-09-12T12:17:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-import-external-Library-files-dll/m-p/65911#M18516 Hi I'm implementing an object based on C# code in Blue Prism which uses methods declared in external libraries. I imported those libraries (ClodesXML.dll) in order to use them in code block but when I run the program it shows an error (Internal : Could not execute code stage because exception thrown by code stage: Could not load file or assembly 'ClosedXML, Version=0.75.0.0, Culture=neutral, PublicKeyToken=fd1eb21b62ae805b' or one of its dependencies. The system cannot find the file specified.) that I believe is related to that library import. Code check is ok and no errors besides that one. Attached i am sending a print of the error. Do you have any ideia to solve this problem? I would be very thankful! <span class="lia-unicode-emoji" title=":grinning_face_with_big_eyes:">😃</span> Fri, 08 Sep 2017 20:51:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-import-external-Library-files-dll/m-p/65911#M18516 Anonymous 2017-09-08T20:51:00Z https://community.blueprism.com/t5/Product-Forum/Unable-to-import-external-Library-files-dll/m-p/65912#M18517 Close and reopen blueprism after using your external dll. Because blueprism loads dll at the start of the application. Tue, 12 Sep 2017 12:17:00 GMT https://community.blueprism.com/t5/Product-Forum/Unable-to-import-external-Library-files-dll/m-p/65912#M18517 RajeshS 2017-09-12T12:17:00Z