sorinh

Hello, I wanted to let you know that the problem has been resolved. I deleted all the compiled .dcu files and rebuilt everything; now it works. Thank you for being so supportive.

Thank you for your support, Remy. I have compared the search paths in the settings option and they appear to be the same. The issue only occurs when I am working on an old project. New programs work ok. All of my projects are using the Delphi 10.1 version. I have recently reinstalled Delphi 10.1 on a new computer and migrated all the programs from my old computer. However, I have made another check and added a new IdSMTP component to an old program, which worked perfectly fine. But when I added the same component to another old program and placed the cursor on the IdSMTP unit in the text, an error message appeared stating that it "cannot resolve unit name 'IdSMTP'". Sorin

No, only what I sent. I attached a screenshot with the error. How can I check if I am referred directly? If by the project search directory you mean "Project > Options > Search Path", then this set is empty. Sorin

I am using Indy version 10.6.2.5341 which was pre-installed with my IDE. When I tried to compile some old applications, I encountered an error message which says: '[dcc32 Fatal Error] Main.pas(25): F2063 Could not compile used unit 'IdSMTP.pas'. It's strange because other old applications or new ones compile without any issues. All the applications are in the same Delphi 10.1 environment. Can you help me with this issue? - Sorin"

Hi. I recently installed Delphi 10.1 on a new PC and transferred some old applications that use Indy clients and server components. However, some of these applications are not functioning properly and throw an error message saying "Could not compile used unit 'Id....'" or "Cannot resolve unit name 'Id...'". Can you help me identify what I might be missing?