Unable to Create New Build Config in nRF Connect (NCS 3.0) – “Add Build Configuration” Always Fails

Hi,

I had a working project for nrf Connect NCS 3.0. I don't know what happened, but now I can't even create a new build configuration. Every time I click on "add build configuration", only this error appears. What is wrong? I removed the original build folder, restarted VSCode several times, and even restarted the whole PC. But nothing helped. How can I solve this bug? Not even the window for build configuration opens.

Info: 

//
{
  "platform": {
    "os": "win32",
    "osVersion": "Windows 11 Pro",
    "osKernel": "10.0.26100",
    "vscode": "1.100.3",
    "electron": "34.5.1",
    "node": "v20.19.0"
  },
  "system": {
    "date": "2025-06-08T20:09:33.969Z",
    "vscodeRoot": ".../Microsoft VS Code/resources/app",
    "nrfConnectForDesktopInstalled": true,
    "vscodeUptime": "00:03:20",
    "osUptime": "05:06:11",
    "cpu": "12th Gen Intel(R) Core(TM) i7-1260P"
  },
  "workspace": {
    "name": "ZoneGuard",
    "workspaceFile": null,
    "folders": [
      ".../ZoneGuard"
    ]
  },
  "sdks": [
    {
      "version": "v3.0.0",
      "path": ".../ncs/v3.0.0"
    }
  ],
  "apps": [
    {
      "workspace": ".../ZoneGuard",
      "uri": ".../ZoneGuard",
      "buildConfigurations": []
    }
  ],
  "toolchains": [
    {
      "version": "3.0.1",
      "path": ".../ncs/toolchains/0b393f9e1b"
    },
    {
      "version": "3.0.0",
      "path": ".../ncs/toolchains/0b393f9e1b"
    },
    {
      "version": "2.4.2",
      "path": ".../ncs/toolchains/31f4403e35"
    }
  ],
  "connectedDevices": [
    {
      "serialNumber": "*********"
    }
  ],
  "tools": {
    ".../arm-zephyr-eabi-gcc.exe": "0.17.0",
    ".../JLink.exe": "8.18",
    ".../nrfjprog.exe": "10.24.2",
    ".../nrfutil.exe": "8.0.0",
    ".../cmake": "3.21.0",
    ".../west.exe": "1.2.0",
    ".../python.exe": "3.12.4",
    ".../ninja.exe": "1.10.2",
    ".../gperf.exe": "3.1",
    ".../dtc.exe": "1.4.7",
    ".../gn.exe": "2223",
    ".../git.exe": "2.37.3.windows.1",
    "arm-gdbPath": ".../arm-zephyr-eabi-gdb.exe",
    "riscv-gdbPath": ".../riscv64-zephyr-elf-gdb.exe"
  },
  "nrfutil": {
    "nrfutil-device": {
      "version": "2.8.8",
      "binPath": ".../nrfutil-device",
      "jlinkInfo": {
        "name": "JlinkARM",
        "version": "JLink_V8.18",
        "versionFormat": "string"
      }
    },
    "nrfutil-sdk-manager": {
      "version": "1.3.0",
      "binPath": ".../nrfutil-sdk-manager"
    }
  },
  "environment": {
    "westEnv": {
      "HOME": "...",
      "HOMEDRIVE": "...",
      "HOMEPATH": "...",
      "PATH": "...",
      "ZEPHYR_TOOLCHAIN_VARIANT": "zephyr",
      "ZEPHYR_SDK_INSTALL_DIR": ".../zephyr-sdk",
      "PYTHONPATH": "..."
    },
    "inherited": {
      "HOME": "...",
      "HOMEDRIVE": "...",
      "HOMEPATH": "...",
      "Path": "...",
      "PATH": "..."
    }
  },
  "terminal": {
    "defaultProfile": null
  },
  "config": {
    "nordic-semiconductor.nrf-connect": {
      "topdir": "",
      "toolchain": {
        "path": ""
      },
      "ozonePath": "",
      "applications": [],
      "applicationOptions": {},
      "kconfig": {
        "interface": "kconfig"
      },
      "west": {
        "env": {
          "$base": "terminal"
        }
      },
      "boardRoots": [
        ""
      ],
      "taskBindings": {},
      "buildTerminal": {
        "condensedProgress": true
      },
      "debugging": {
        "flash": true,
        "bindings": {},
        "justMyCode": false
      },
      "activeAppFollowActiveEditor": true,
      "flash": {
        "softreset": false,
        "erase": false,
        "recover": true
      },
      "enableTelemetry": true,
      "thirdpartyIntegration": {},
      "toolchainManager": {
        "indexURL": null,
        "installDirectory": null
      },
      "nrfutil": {
        "home": null
      },
      "defaultOpenAction": "ask",
      "terminalProfile": {
        "shell": null
      }
    },
    "nordic-semiconductor.nrf-terminal": {
      "terminalMode": "character"
    },
    "marus25.cortex-debug": {
      "variableUseNaturalFormat": true,
      "liveWatchRefreshRate": "300",
      "armToolchainPath": null,
      "armToolchainPrefix": "arm-none-eabi",
      "gdbPath": null,
      "objdumpPath": null,
      "JLinkGDBServerPath": null,
      "openocdPath": null,
      "pyocdPath": null,
      "PEGDBServerPath": null,
      "stutilPath": null,
      "stlinkPath": null,
      "stm32cubeprogrammer": null,
      "enableTelemetry": true,
      "dbgServerLogfile": null
    }
  },
  "extensions": {
    "internal": {
      "nordic-semiconductor.nrf-connect": {
        "version": "2025.5.152",
        "path": ".../nordic-semiconductor.nrf-connect-2025.5.152-win32-x64",
        "isActive": true
      },
      "nordic-semiconductor.nrf-terminal": {
        "version": "2024.9.14",
        "path": ".../nordic-semiconductor.nrf-terminal-2024.9.14",
        "isActive": true
      },
      "nordic-semiconductor.nrf-devicetree": {
        "version": "2025.4.22",
        "path": ".../nordic-semiconductor.nrf-devicetree-2025.4.22",
        "isActive": true
      },
      "nordic-semiconductor.nrf-kconfig": {
        "version": "2025.4.26",
        "path": ".../nordic-semiconductor.nrf-kconfig-2025.4.26",
        "isActive": true
      }
    },
    "external": {
      "marus25.cortex-debug": "1.12.1",
      "ms-vscode.cpptools": "1.25.3",
      "ms-vscode.js-debug": "1.100.1",
      "ms-vscode.js-debug-companion": "1.1.3",
      "ms-vscode.vscode-js-profile-table": "1.0.10",
      "actboy168.tasks": "0.16.1",
      "bbenoist.QML": "1.0.0",
      "cschlosser.doxdocgen": "1.4.0",
      "dan-c-underwood.arm": "1.7.4",
      "eamodio.gitlens": "17.1.1",
      "GitHub.copilot": "1.330.0",
      "GitHub.copilot-chat": "0.27.3",
      "jeff-hykin.better-cpp-syntax": "1.27.1",
      "mcu-debug.debug-tracker-vscode": "0.0.15",
      "mcu-debug.memory-view": "0.0.25",
      "mcu-debug.peripheral-viewer": "1.4.6",
      "mcu-debug.rtos-views": "0.0.7",
      "ms-python.debugpy": "2025.8.0",
      "ms-python.python": "2025.6.1",
      "ms-python.vscode-pylance": "2025.5.1",
      "ms-vscode.cpptools-extension-pack": "1.3.1",
      "ms-vscode.cpptools-themes": "2.0.0",
      "ms-vscode.hexeditor": "1.11.1",
      "ms-vscode.vscode-serial-monitor": "0.13.1",
      "shd101wyy.markdown-preview-enhanced": "0.8.18",
      "trond-snekvik.gnu-mapfiles": "1.1.0",
      "yzane.markdown-pdf": "1.5.0",
      "yzhang.markdown-all-in-one": "3.6.3",
      "ZixuanWang.linkerscript": "1.0.4"
    }
  }
}
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