Running 'scroll help' in Windows fails after installation

[CRTandKDU]

After installing through: npm install -g scroll-cli on Windows 10 Professional 1803, with node v16.13.1, scroll help fails immediately with:

C:\Users\jmchauvet\AppData\Roaming\npm\node_modules\scroll-cli\node_modules\jtree\products\GrammarLanguage.js:2321
      this._cache_rootConstructorClass = def.getLanguageDefinitionProgram()._compileAndReturnNodeTypeMap()[rootNodeTypeId]
                                                                                                          ^

TypeError: Cannot read properties of undefined (reading 'scrollScriptNode')
    at HandGrammarProgram.compileAndReturnRootConstructor (C:\Users\jmchauvet\AppData\Roaming\npm\node_modules\scroll-cli\node_modules\jtree\products\GrammarLanguage.js:2321:107)
    at getCompiler (C:\Users\jmchauvet\AppData\Roaming\npm\node_modules\scroll-cli\scroll.js:138:55)
    at Object.<anonymous> (C:\Users\jmchauvet\AppData\Roaming\npm\node_modules\scroll-cli\scroll.js:145:31)
    at Module._compile (node:internal/modules/cjs/loader:1101:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1153:10)
    at Module.load (node:internal/modules/cjs/loader:981:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12)
    at node:internal/main/run_main_module:17:47

Please advise. Thanks in advance.