Building epub

[OHappyDay]

Dear all,

I tried to build an epub file (already on version 2.45.0). It failed with these error messages:

Although node is version 22.22.3 it complains about version 18.19.1

I could solve the problem by erasing the .ptx folder completely and rebuilding the ebook. 
This time the build was successful.

Is there something that can be done on installation of new versions to check whether there is a mismatch between installed node version and the version of node that is somehow referenced in the .ptx folder?

Thanks

Klaus

Collected Errors:

npm

Collected Errors:

ERR! code EBADENGINE

Collected Errors:

npm ERR! engine Unsupported engine

npm ERR! engine Not compatible with your version of node/npm: rimraf@6.1.3

Collected Errors:

npm

Collected Errors:

ERR! notsup Not compatible with your version of node/npm: rimraf@6.1.3

Collected Errors:

npm ERR!

Collected Errors:

notsup Required: {"node":"20 || >=22"}

npm ERR! notsup Actual: {"npm":"9.2.0"}

Collected Errors:

Collected Errors:

npm ERR!

Collected Errors:

A complete log of this run can be found in:

npm ERR! /home/klaus/.npm/_logs/2026-07-28T14_33_39_194Z-debug-0.log

Collected Errors:

node:internal/modules/cjs/loader:1137

throw err;

^

Error: Cannot find module '@mathjax/src/js/util/asyncLoad/node.js'

Require stack:

- /home/klaus/.ptx/2.45.0/core/script/mjsre/mj-sre-page.js

at Module._resolveFilename (node:internal/modules/cjs/loader:1134:15)

at Module._load (node:internal/modules/cjs/loader:975:27)

at Module.require (node:internal/modules/cjs/loader:1225:19)

at require (node:internal/modules/helpers:177:18)

at Object.<anonymous> (/home/klaus/.ptx/2.45.0/core/script/mjsre/mj-sre-page.js:40:1)

at Module._compile (node:internal/modules/cjs/loader:1356:14)

at Module._extensions..js (node:internal/modules/cjs/loader:1414:10)

at Module.load (node:internal/modules/cjs/loader:1197:32)

at Module._load (node:internal/modules/cjs/loader:1013:12)

at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:128:12) {

code: 'MODULE_NOT_FOUND',

requireStack: [ '/home/klaus/.ptx/2.45.0/core/script/mjsre/mj-sre-page.js' ]

}

Node.js v18.19.1

Collected Errors:

Document is empty, line 1, column 1 (mj-output-svg.html, line 1)

Failed to build without errors. Exiting...

[D. Brian Walton]

I had a similar node versioning issue recently where the system had one version of node installed and I had a different version in another environment. nvm was somehow defaulting back to the older version. I think I tried installing the newer version inside the virtual environment and it worked one time, and then the next time I opened the environment, nvm had reverted to the older version. Instead of installing, I had nvm reselect the newer version and that seems to have stuck.

I was just fumbling around, so my memory may have things mixed up here. I don't even know if nvm respects anything about the virtual environment because I don't think it is a python-related entity.

Brian

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