Error when logging in after installing Matlab 2022b

I have Matlab 2022b installed on Red Hat 8.7 computer. That required these packages:

• Lmod
• lua-posix packages
• lua-filesystem
• lua-term
• tcl

Now I see this on a command line when I sign in with root or regular accounts via SSH:

/usr/bin/lua: /usr/share/lmod/lmod/libexec/addto:65: module 'posix' not found:
no field package.preload['posix']
no file '/usr/share/lua/5.4/posix.lua'
no file '/usr/share/lua/5.4/posix/init.lua'
no file '/usr/lib64/lua/5.4/posix.lua'
no file '/usr/lib64/lua/5.4/posix/init.lua'
no file '/usr/lib64/lua/5.4/posix.so'
no file '/usr/lib64/lua/5.4/loadall.so'
stack traceback:
[C]: in function 'require'
/usr/share/lmod/lmod/libexec/addto:65: in main chunk
[C]: in ?
/usr/bin/lua: /usr/share/lmod/lmod/libexec/addto:65: module 'posix' not found:
no field package.preload['posix']
no file '/usr/share/lua/5.4/posix.lua'
no file '/usr/share/lua/5.4/posix/init.lua'
no file '/usr/lib64/lua/5.4/posix.lua'
no file '/usr/lib64/lua/5.4/posix/init.lua'
no file '/usr/lib64/lua/5.4/posix.so'
no file '/usr/lib64/lua/5.4/loadall.so'
stack traceback:
[C]: in function 'require'
/usr/share/lmod/lmod/libexec/addto:65: in main chunk
[C]: in ?
/usr/bin/lua: /usr/share/lmod/lmod/libexec/addto:65: module 'posix' not found:
no field package.preload['posix']
no file '/usr/share/lua/5.4/posix.lua'
no file '/usr/share/lua/5.4/posix/init.lua'
no file '/usr/lib64/lua/5.4/posix.lua'
no file '/usr/lib64/lua/5.4/posix/init.lua'
no file '/usr/lib64/lua/5.4/posix.so'
no file '/usr/lib64/lua/5.4/loadall.so'
stack traceback:
[C]: in function 'require'
/usr/share/lmod/lmod/libexec/addto:65: in main chunk
[C]: in ?

I am not sure if this is related, but I mount an NFS share for the /home directories.

Are there any additional packages I need to install, or files I might be missing?

[Suman]

Hi Tandrew,

You can try adding the following import before requiring the "posix" module:

require "luarocks.loader"

Please let me know whether it worked or not.

Cheers,

Suman

[tandrew]

I added that line to /usr/share/lmod/lmod/libexec/addto. I also installed luarocks, because I did not have it before. I also tried using a Red Hat 8 PC, with a local home directory instead of NFS. Now on both computers I get this slightly different message:

/usr/bin/lua: /usr/share/lmod/lmod/libexec/addto:65: module 'luarocks.loader' not found:
no field package.preload['luarocks.loader']
no file '/usr/share/lua/5.4/luarocks/loader.lua'
no file '/usr/share/lua/5.4/luarocks/loader/init.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader/init.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader.so'
no file '/usr/lib64/lua/5.4/loadall.so'
no file '/usr/lib64/lua/5.4/luarocks.so'
no file '/usr/lib64/lua/5.4/loadall.so'
stack traceback:
[C]: in function 'require'
/usr/share/lmod/lmod/libexec/addto:65: in main chunk
[C]: in ?
/usr/bin/lua: /usr/share/lmod/lmod/libexec/addto:65: module 'luarocks.loader' not found:
no field package.preload['luarocks.loader']
no file '/usr/share/lua/5.4/luarocks/loader.lua'
no file '/usr/share/lua/5.4/luarocks/loader/init.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader/init.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader.so'
no file '/usr/lib64/lua/5.4/loadall.so'
no file '/usr/lib64/lua/5.4/luarocks.so'
no file '/usr/lib64/lua/5.4/loadall.so'
stack traceback:
[C]: in function 'require'
/usr/share/lmod/lmod/libexec/addto:65: in main chunk
[C]: in ?
/usr/bin/lua: /usr/share/lmod/lmod/libexec/addto:65: module 'luarocks.loader' not found:
no field package.preload['luarocks.loader']
no file '/usr/share/lua/5.4/luarocks/loader.lua'
no file '/usr/share/lua/5.4/luarocks/loader/init.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader/init.lua'
no file '/usr/lib64/lua/5.4/luarocks/loader.so'
no file '/usr/lib64/lua/5.4/loadall.so'
no file '/usr/lib64/lua/5.4/luarocks.so'
no file '/usr/lib64/lua/5.4/loadall.so'
stack traceback:
[C]: in function 'require'
/usr/share/lmod/lmod/libexec/addto:65: in main chunk
[C]: in ?

[Suman]

Hi Tandrew,

It seems that Lua is unable to get the exact path for locating desired packages. That's why the modules like "posix" and "luarocks.loader" are being shown as "Not found".

There are two environment variables LUA_PATH and LUA_CPATH which contain all the paths related to various Lua packages. You can add the paths used by "luarocks" to these environment variables using he following command:

eval "$(luarocks path)"

Please let me know whether this approach worked for you or not.

Cheers,

Suman