Error

gyp verb could not find "python"

gyp verb could not find "python". checking python launcher
gyp verb could not find "python". guessing location
gyp verb ensuring that file exists: C:\Python27\python.exe

solv 1
- delete node_modules folder
- running npm install --global windows-build-tools
- reinstalling node modules or node-sass with npm install
- node-sass should check the node version more
solv 2
- download and install Python2.7
- https://www.python.org/downloads/release/python-2717/
ref
- https://stackoverflow.com/a/53009640

unable to verify the first certificate

Error: unable to verify the first certificate
Downloading Python failed. Error: Error: unable to verify the first certificate
    at TLSSocket.onConnectSecure (_tls_wrap.js:1321:34)
    at TLSSocket.emit (events.js:210:5)
    at TLSSocket._finishInit (_tls_wrap.js:794:8)
    at TLSWrap.ssl.onhandshakedone (_tls_wrap.js:608:12) {
  code: 'UNABLE_TO_VERIFY_LEAF_SIGNATURE'

solv

npm config set strict-ssl false

# after install, turn it back
npm config set strict-ssl true

ref
- https://stackoverflow.com/a/21385322/510222

SCRIPT1046: strict 모드에서는 속성을 여러 번 정의할 수 없습니다.

SCRIPT1046: strict 모드에서는 속성을 여러 번 정의할 수 없습니다.
app.js (661,1)

                    domProps: {
                      checked:
                        mvp.dYn === "Y" ? "checked" : "",
                      value: index,
                      checked: _vm._q(_vm.checkedIdx, index)
                    },

solv

# before
<input type="radio" name="list"
:checked="mvp.dYn === 'Y' ? 'checked' : ''"
:value="index"
v-model="checkedIdx">

# after
<input type="radio" name="list"
:checked="mvp.dYn === 'Y' ? 'checked' : ''"
:value="index">

v-model과 :checked는 동시에 사용할 수 없음

SCRIPT1003: ':'가 필요합니다.

SCRIPT1003: ':'가 필요합니다.
chunk-vendors.js (506,1)

/***/ "./node_modules/vue-clamp/Clamp.js":
/*!*****************************************!*\
  !*** ./node_modules/vue-clamp/Clamp.js ***!
  \*****************************************/
/*! exports provided: default */
/***/ (function(module, __webpack_exports__, __webpack_require__) {

"use strict";
eval("__webpack_require__.r(__webpack_exports__);\n/* harmony import */ var resize_detector__WEBPACK_IMPORTED_MODULE_0__ =

solv

# vue.config.js

module.exports = {
  transpileDependencies: [
    'vue-clamp',
  ],

log
Could not initialize class org.apache.maven.plugin.war.util.WebappStructureSerializer pom.xml /org.springframework.samples.jpetstore line 1 Maven Configuration Problem
solv

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>3.3.1</version>
</plugin>

https://stackoverflow.com/a/68598931/510222
log
cvc-id.3: A field of identity constraint 'web-app-servlet-name-uniqueness' matched element 'web-app', but this element does not have a simple type. web.xml
solv

xsi:schemaLocation="http://Java.sun.com/xml/ns/javaee

web-app 태그의 sci:schemaLocation 의 java를 Java 대문자로 변경하면 해결
https://heekng.tistory.com/95