feat(markdown): add error log for importCode plugin (#1273)

packages/markdown/src/plugins/importCodePlugin/resolveImportCode.ts

@@ -1,4 +1,4 @@
-import { fs, path } from '@vuepress/utils'
+import { colors, fs, logger, path } from '@vuepress/utils'
 import type { MarkdownEnv } from '../../types.js'
 import type { ImportCodeTokenMeta } from './types.js'
 
@@ -15,6 +15,9 @@ export const resolveImportCode = (
     // if the importPath is relative path, we need to resolve it
     // according to the markdown filePath
     if (!filePath) {
+      logger.error(
+        `Import file ${colors.magenta(importPath)} can not be resolved`
+      )
       return {
         importFilePath: null,
         importCode: 'Error when resolving path',
@@ -25,6 +28,7 @@ export const resolveImportCode = (
 
   // check file existence
   if (!fs.existsSync(importFilePath)) {
+    logger.error(`Import file ${colors.magenta(importPath)} not found`)
     return {
       importFilePath,
       importCode: 'File not found',