Dear Chris,
I used the Ortho+ plugin to process a set of RGB images over a forest using the latest version of Metashape Pro for linux (2.0.1). Specifically, I used the Best Practices workflow using GCPs to georeference the images. Steps 1, 2 and 3 (from image alignment, manual marking of GCPs to optimisation of the sparse cloud) all work fine, however, when I want to run step 4 I get the error "Null point cloud", this means that the system does not recognise or detect the sparse cloud.
Log error
Agisoft Metashape Professional Version: 2.0.1 build 16069 (64 bit)
Platform: Linux
BuildModel: source data = Point cloud, surface type = Height field, face count = High, OOC version, interpolation = Enabled, vertex colors = 1
Finished processing in 0.010364 sec (exit code 0)
Error: Null point cloud
So I tried to install new Python3 dependencies but the error remained.
Then, I uninstalled the Linux version of metashape pro 2.1.0 and installed the previous version 1.8.5 and when I ran step 4 to create the mesh and the orthomosaic it worked.
So, maybe the error derives from some incompatibility of Ortho + with the latest version of metashape pro version 2.0.1 for Linux
Best
Christian