diff --git a/packages/gitmoji-changelog-cli/src/cli.e2e.js b/packages/gitmoji-changelog-cli/src/cli.e2e.js
index e6b5e2d..9f86984 100644
--- a/packages/gitmoji-changelog-cli/src/cli.e2e.js
+++ b/packages/gitmoji-changelog-cli/src/cli.e2e.js
@@ -443,7 +443,7 @@ describe('generate changelog', () => {
   })
 
   async function makeChanges(fileName) {
-    fs.writeFileSync(path.join(testDir, fileName))
+    fs.writeFileSync(path.join(testDir, fileName), '')
   }
 
   async function makeCustomConfig(config) {
diff --git a/packages/gitmoji-changelog-cli/src/cli.js b/packages/gitmoji-changelog-cli/src/cli.js
index 24ef57f..03936bd 100644
--- a/packages/gitmoji-changelog-cli/src/cli.js
+++ b/packages/gitmoji-changelog-cli/src/cli.js
@@ -6,7 +6,7 @@ const semver = require('semver')
 const semverCompare = require('semver-compare')
 const rc = require('rc')
 
-const { generateChangelog, logger } = require('@gitmoji-changelog/core')
+const { generateChangelog, logger, FunctionalError } = require('@gitmoji-changelog/core')
 const { buildMarkdownFile, getLatestVersion } = require('@gitmoji-changelog/markdown')
 
 const issueReporter = require('issue-reporter')
@@ -138,7 +138,7 @@ async function getChangelog(options, projectInfo) {
   const release = options.release === 'from-package' ? projectInfo.version : options.release
 
   if (!semver.valid(release)) {
-    throw new Error(`${release} is not a valid semver version.`)
+    throw new FunctionalError(`${release} is not a valid semver version.`)
   }
 
   const enhancedOptions = {
diff --git a/packages/gitmoji-changelog-core/src/index.js b/packages/gitmoji-changelog-core/src/index.js
index 0800797..8143a40 100644
--- a/packages/gitmoji-changelog-core/src/index.js
+++ b/packages/gitmoji-changelog-core/src/index.js
@@ -187,4 +187,5 @@ function getLastCommitDate(commits) {
 module.exports = {
   generateChangelog,
   logger,
+  FunctionalError,
 }