MDL Loader: Unable to load library (DLL or MDL shared library)

Problem:

Attempting to load TerraScan or one of the other Terrasolid MDL applications in MicroStation or other supported Bentley application results in an error, “MDL Loader: Unable to load library (DLL or MDL shared library) tscan” in the message center, usually preceded by a “OS could not load c:\terra64\ma\tscan.dll, error 127.”

Unable to Load Library

Probable Resolution #1:

Ensure that you have launched the regular MicroStation, or other supported Bentley application, and not the “High Security” version of the Bentley product. The high security version typically has a lock on the icon.

MicroStation CE Regular vs High Security

Probable Resolution #2:

Ensure that the Terrasolid module(s) were installed using the right-click and “Run as Administrator” option on the setup.exe.

TScan: Install using Run As Administrator

Probable Resolution #3:

Ensure that the correct installer was used to install the applicable version of the Terrasolid module for the Bentley application.

  • For MicroStation CONNECT edition, PowerDraft CONNECT Edition, and Open Roads Designer CONNECT edition, be sure to use the CE installers, “tscan_CE_eng_018_018”.
  • For MicroStation v8i, be sure to use the v8i installers, “tscan_v8i_eng_018_018”.
  • For MicroStation v8, be sure to use the v8 installers, “tscan_v8_eng_018_018″.
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2 thoughts on “MDL Loader: Unable to load library (DLL or MDL shared library)

  1. Avatar slehmuth says:

    So I’m working with MicroStation V8i (Select Serios 10) version 08.11.09.908…is this version compatible with tscan_v8_eng_019_001? I’m getting the same error as above.

    1. While Terrasolid and ourselves stopped doing extensive testing with v8i after select series 4, due to all the latest tools and changes being in the CONNECT edition products over the past few years, we would expect the tools to be compatible and work with the latest v8i updates. The problem you’re encountering is covered in probable resolution #3 of this post. For MicroStation v8i, be sure to use the v8i installers, “tscan_v8i_eng_019_001”.

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