Error: Command failed: npx tsc --outDir "/home/user/projects/btp-cap-genai-rag/gen/srv/"

[mgnxbsskmh-oss]

After cloning the repository in Business Application Studio, applying the solutions #44, #45, #46, #47, and then running npm run build:mbt in project's root folder, I get the following error

genai-mail-insights@1.0.0 build:mbt
mbt build

[2026-01-26 22:06:53] INFO Cloud MTA Build Tool version 1.2.34
[2026-01-26 22:06:53] INFO generating the "Makefile_20260126220653.mta" file...
[2026-01-26 22:06:53] INFO done
[2026-01-26 22:06:53] INFO executing the "make -f Makefile_20260126220653.mta p=cf mtar= strict=true mode=" command...
[2026-01-26 22:06:53] INFO validating the MTA project
[2026-01-26 22:06:53] INFO running the "before-all" build...
[2026-01-26 22:06:53] INFO executing the "npm run build" command...

genai-mail-insights@1.0.0 build
npm run build:cds && npm run build:ui && npm run build:ts

genai-mail-insights@1.0.0 build:cds
cds-ts build --profile production

building project [/home/user/projects/btp-cap-genai-rag], clean [true]
cds-dk [8.7.1], cds [8.7.1], compiler [6.6.2], home [/home/user/projects/btp-cap-genai-rag/node_modules/@sap/cds]

{
build: {
target: 'gen',
tasks: [
{ for: 'hana', src: 'db', options: { model: ['db', 'srv', 'app'] }},
{ for: 'nodejs', src: 'srv', options: { model: ['db', 'srv', 'app'] }},
{ for: 'typescript', src: '.', options: { model: ['db', 'srv', 'app', '.'] }}
]
}
}

..................................................done > wrote output to:
gen/db/package.json
gen/db/src/.hdiconfig
gen/db/src/gen/.hdiconfig
gen/db/src/gen/.hdinamespace
gen/db/src/gen/MailInsightsService.Mails.hdbview
gen/db/src/gen/MailInsightsService.Translations.hdbview
gen/db/src/gen/ai.db.Mails.hdbtable
gen/db/src/gen/ai.db.Translations.hdbtable
gen/db/undeploy.json
gen/srv/.cdsrc.json
gen/srv/eslint.config.js
gen/srv/package-lock.json
gen/srv/package.json
gen/srv/srv/_i18n/i18n.json
gen/srv/srv/constants.ts
gen/srv/srv/csn.json
gen/srv/srv/mail-insights-service.ts
gen/srv/srv/odata/v4/MailInsightsService.xml
gen/srv/srv/schemas.ts
gen/srv/srv/types.ts
gen/srv/srv/utils/ai-core.ts

Error: Command failed: npx tsc --outDir "/home/user/projects/btp-cap-genai-rag/gen/srv/"

<--- Last few GCs --->

[9855:0x25a85000] 48753 ms: Scavenge 2030.2 (2080.4) -> 2022.5 (2080.4) MB, pooled: 0 MB, 1.29 / 0.00 ms (average mu = 0.513, current mu = 0.496) allocation failure;
[9855:0x25a85000] 48758 ms: Scavenge 2030.2 (2080.4) -> 2022.4 (2096.4) MB, pooled: 0 MB, 2.07 / 0.00 ms (average mu = 0.513, current mu = 0.496) allocation failure;

<--- JS stacktrace --->

FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory
----- Native stack trace -----

1: 0xe3811e node::OOMErrorHandler(char const*, v8::OOMDetails const&) [node]
2: 0x125fb70 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [node]
3: 0x125fe47 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [node]
4: 0x148d885 [node]
5: 0x14a70f9 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]
6: 0x147b7c8 v8::internal::HeapAllocator::AllocateRawWithLightRetrySlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [node]
7: 0x147c6f5 v8::internal::HeapAllocator::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [node]
8: 0x14553ce v8::internal::Factory::NewFillerObject(int, v8::internal::AllocationAlignment, v8::internal::AllocationType, v8::internal::AllocationOrigin) [node]
9: 0x18b69cc v8::internal::Runtime_AllocateInYoungGeneration(int, unsigned long*, v8::internal::Isolate*) [node]
10: 0x7fa49e66c476
Aborted (core dumped)

at genericNodeError (node:internal/errors:983:15)
at wrappedFn (node:internal/errors:537:14)
at ChildProcess.exithandler (node:child_process:414:12)
at ChildProcess.emit (node:events:524:28)
at ChildProcess.emit (node:domain:489:12)
at maybeClose (node:internal/child_process:1101:16)
at Process.ChildProcess._handle.onexit (node:internal/child_process:304:5) {

code: 134,
killed: false,
signal: null,
cmd: 'npx tsc --outDir "/home/user/projects/btp-cap-genai-rag/gen/srv/"',
stdout: '',
stderr: '\n' +
'<--- Last few GCs --->\n' +
'\n' +
'[9855:0x25a85000] 48753 ms: Scavenge 2030.2 (2080.4) -> 2022.5 (2080.4) MB, pooled: 0 MB, 1.29 / 0.00 ms (average mu = 0.513, current mu = 0.496) allocation failure; \n' +
'[9855:0x25a85000] 48758 ms: Scavenge 2030.2 (2080.4) -> 2022.4 (2096.4) MB, pooled: 0 MB, 2.07 / 0.00 ms (average mu = 0.513, current mu = 0.496) allocation failure; \n' +
'\n' +
'\n' +
'<--- JS stacktrace --->\n' +
'\n' +
'FATAL ERROR: Reached heap limit Allocation failed - JavaScript heap out of memory\n' +
'----- Native stack trace -----\n' +
'\n' +
' 1: 0xe3811e node::OOMErrorHandler(char const*, v8::OOMDetails const&) [node]\n' +
' 2: 0x125fb70 v8::Utils::ReportOOMFailure(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [node]\n' +
' 3: 0x125fe47 v8::internal::V8::FatalProcessOutOfMemory(v8::internal::Isolate*, char const*, v8::OOMDetails const&) [node]\n' +
' 4: 0x148d885 [node]\n' +
' 5: 0x14a70f9 v8::internal::Heap::CollectGarbage(v8::internal::AllocationSpace, v8::internal::GarbageCollectionReason, v8::GCCallbackFlags) [node]\n' +
' 6: 0x147b7c8 v8::internal::HeapAllocator::AllocateRawWithLightRetrySlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [node]\n' +
' 7: 0x147c6f5 v8::internal::HeapAllocator::AllocateRawWithRetryOrFailSlowPath(int, v8::internal::AllocationType, v8::internal::AllocationOrigin, v8::internal::AllocationAlignment) [node]\n' +
' 8: 0x14553ce v8::internal::Factory::NewFillerObject(int, v8::internal::AllocationAlignment, v8::internal::AllocationType, v8::internal::AllocationOrigin) [node]\n' +
' 9: 0x18b69cc v8::internal::Runtime_AllocateInYoungGeneration(int, unsigned long*, v8::internal::Isolate*) [node]\n' +
'10: 0x7fa49e66c476 \n' +
'Aborted (core dumped)\n',
messages: []
}
[2026-01-26 22:07:43] ERROR the "before-all"" build failed: could not execute the "npm run build" command: exit status 1
make: *** [Makefile_20260126220653.mta:28: pre_build] Error 1
[2026-01-26 22:07:43] ERROR could not build the MTA project: could not execute the "make -f Makefile_20260126220653.mta p=cf mtar= strict=true mode=" command: exit status 2
Error: could not build the MTA project: could not execute the "make -f Makefile_20260126220653.mta p=cf mtar= strict=true mode=" command: exit status 2

[mgnxbsskmh-oss]

Dear @kay-schmitteckert I would like to kindly ask you if the team responsable for the GenAI Mail Insights: Develop a CAP application using GenAI and Retrieval Augmented Generation (RAG) Mission in the SAP Discovery Center could provide the exact Project Board cards and steps to execute for deploying this app.

In my company, we are exploring Gen AI and how we could benefit from it.

Other IT departments (non SAP) are presenting exactly this use case case using other technologies. However, I trust this solution can be perfectly (and even better) implemented using SAP BTP services and this is what I try to showcase to the VPs and Stakeholders - I have their attention and interest, they are willing to giving me the opportunity but I need to deliver a working example.

For the moment, the other (competing) technologies are gaining space as I am not able to successfully deploy this app - which I consider a quick win.

I would really appreciate to get the exact steps I have to conduct in order to deploy this app in SAP BTP.

As a sum-up of what I am doing is basically setting up a completely new Full Stack Cloud Application DEV Space in SAP Business Application Studio to start from a clean sheet, I run the steps described in the Mission and I apply the solutions you kindly provided me and for which I very much appreciate your support.

So far I am stack in the Build step where the different issues I have been facing were #47 , #46 , #45 , #44 . The last issue is the one described here but I am afraid I might be facing more later and will be running out of time as next week is quite important since we are getting all together (Stakeholders, VP, IT Directors and IT Architects) into a workshop where the potential solutions will be showcased.

[kay-schmitteckert]

@mgnxbsskmh-oss please contact me via mail