Please check your version of OpenStudio (OS). If I remember, LB tools v1.2 requires OS >= 2.5 which has EP version 9.4 or 9.5.
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To be sure check the compatibility matrix:
For instance, LBT 1.2.0 works with OpenStudio 3.1.0.
If you follow the link for OpenStudio, it specifies the EnergyPlus version required in its installation notes:
It changes with each few released version, so it’s something to keep in mind for the future.
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