Hi,
I can now provide a MWE that I experimented so far, and its corresponding error message, respectively:

The example was directly based on:
OpenFAST/docs/source/user/beamdyn/examples/bd_driver_dynamic_nrel_5mw.inp

I added the following lines into the original file:
1 NumPointLoads  Number of Point Loads (primary input file section header)
 MULTIPLE POINT LOADS 
0.5 PointLoad(1,1)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,2)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,3)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,4)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,5)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,6)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,7)  Nodal point loads  Node No DOF No
 Accordingly, the modified file, bd_driver_dynamic_nrel_5mw.inp, became the following:
 BEAMDYN V1.00.00 Driver INPUT FILE 
Dynamic analysis of rotating NREL 5MW blade under gravity force
 SIMULATION CONTROL 
0.018 t_initial  Starting time of simulation (s)
2E02 t_final  Ending time of simulation (s)
2E03 dt  Time increment size (s)
 GRAVITY PARAMETER 
0.0 Gx  Component of gravity vector along X direction (m/s^2)
0.0 Gy  Component of gravity vector along Y direction (m/s^2)
0.0 Gz  Component of gravity vector along Z direction (m/s^2)
 FRAME PARAMETER 
0.0 GlbPos(1)  Component of position vector of the reference blade frame along X direction (m)
0.0 GlbPos(2)  Component of position vector of the reference blade frame along Y direction (m)
1.0 GlbPos(3)  Component of position vector of the reference blade frame along Z direction (m)
The following 3 by 3 matrix is the direction cosine matirx ,GlbDCM(3,3),
relates global frame to reference blade frame
1.000E+00 0.000E+00 0.000E+00
0.000E+00 1.000E+00 0.000E+00
0.000E+00 0.000E+00 1.000E+00
 ROOT VELOCITY PARAMETER 
1.0006 RootVel(4)  Component of angular velocity vector of the beam root about X axis (rad/s)
0.0 RootVel(5)  Component of angular velocity vector of the beam root about Y axis (rad/s)
0.0 RootVel(6)  Component of angular velocity vector of the beam root about Z axis (rad/s)
 APPLIED FORCE 
0.0 DistrLoad(1)  Component of distributed force vector along X direction (N/m)
0.0 DistrLoad(2)  Component of distributed force vector along Y direction (N/m)
0.0 DistrLoad(3)  Component of distributed force vector along Z direction (N/m)
0.0 DistrLoad(4)  Component of distributed moment vector along X direction (Nm/m)
0.0 DistrLoad(5)  Component of distributed moment vector along Y direction (Nm/m)
0.0 DistrLoad(6)  Component of distributed moment vector along Z direction (Nm/m)
0.0 TipLoad(1)  Component of concentrated force vector at blade tip along X direction (N)
0.0 TipLoad(2)  Component of concentrated force vector at blade tip along Y direction (N)
0.0 TipLoad(3)  Component of concentrated force vector at blade tip along Z direction (N)
0.0 TipLoad(4)  Component of concentrated moment vector at blade tip along X direction (Nm)
0.0 TipLoad(5)  Component of concentrated moment vector at blade tip along Y direction (Nm)
0.0 TipLoad(6)  Component of concentrated moment vector at blade tip along Z direction (Nm)
1 NumPointLoads  Number of Point Loads (primary input file section header)
 MULTIPLE POINT LOADS 
0.5 PointLoad(1,1)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,2)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,3)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,4)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,5)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,6)  Nodal point loads  Node No DOF No
0.0 PointLoad(1,7)  Nodal point loads  Node No DOF No
 PRIMARY INPUT FILE 
"bd_primary_nrel_5mw_dynamic.inp" InputFile  Name of the primary input file
 This was executed as:
./beamdyn_driver bd_driver_dynamic_nrel_5mw.inp
 The error message as was below:
[code] **************************************************************************************************
BeamDyn Driver
Copyright (C) National Renewable Energy Laboratory
This program is licensed under Apache License Version 2.0 and comes with ABSOLUTELY NO WARRANTY.
See the “LICENSE” file distributed with this software for details.
Running BeamDyn Driver
a part of OpenFAST  v1.0.0dirty
linked with NWTC Subroutine Library
BD_ReadDvrFile:Invalid numerical input for file “bd_driver_dynamic_nrel_5mw.inp” occurred while
trying to read PointLoad.
BeamDyn Driver encountered simulation error level: FATAL ERROR
Aborting program.[/code]
Could you please at least give me some hint about where I should look at for the solution, if possible?
Many thanks,
Kuti