diff --git a/core/copy.go b/core/copy.go
index 28a0d9d..e36030f 100644
--- a/core/copy.go
+++ b/core/copy.go
@@ -15,7 +15,10 @@ import (
 
 // CopyArgument copies a field from an entry to the clipboard.
 func CopyArgument(targetLocation string, field int) error {
-	if isFile, _ := back.TargetIsFile(targetLocation, true, 2); isFile {
+	if isFile, _, err := back.TargetIsFile(targetLocation, true, 2); isFile {
+		if err != nil {
+			return err
+		}
 
 		decryptedEntry, err := crypt.DecryptFileToSlice(targetLocation)
 		if err != nil {
diff --git a/core/init.go b/core/init.go
index 64880b3..9add3b9 100644
--- a/core/init.go
+++ b/core/init.go
@@ -21,7 +21,7 @@ func LibmuttonInit(inputCB func(prompt string) string, clientSpecificIniData [][
 		// ensure ssh key file exists
 		fallbackSSHKey := back.Home + global.PathSeparator + ".ssh" + global.PathSeparator + "id_ed25519"
 		sshKeyPath := cmp.Or(back.ExpandPathWithHome(inputCB(back.AnsiBold+"Note:"+back.AnsiReset+" Only key-based authentication is supported (keys may optionally be passphrase-protected).\n      The remote server must already be in your ~"+global.PathSeparator+".ssh"+global.PathSeparator+"known_hosts file.\n\nSSH private identity file path (falls back to \""+fallbackSSHKey+"\"):")), fallbackSSHKey)
-		sshKeyIsFile, _ := back.TargetIsFile(sshKeyPath, false, 0)
+		sshKeyIsFile, _, _ := back.TargetIsFile(sshKeyPath, false, 0) // error is ignored because errorOnFail is false
 		if !sshKeyIsFile {
 			return errors.New("SSH identity file not found: " + sshKeyPath)
 		}
diff --git a/core/launchClipClearProcessCLIGeneric.go b/core/launchClipClearProcessCLIGeneric.go
index 7a2fb27..57aa621 100644
--- a/core/launchClipClearProcessCLIGeneric.go
+++ b/core/launchClipClearProcessCLIGeneric.go
@@ -13,7 +13,7 @@ import (
 // For non-interactive CLI implementations, an entirely separate process is created for this purpose.
 func LaunchClipClearProcess(copySubject string) {
 	cmd := exec.Command(os.Args[0], "clipclear")
-	back.WriteToStdin(cmd, copySubject)
-	cmd.Start()
+	_ = back.WriteToStdin(cmd, copySubject)
+	_ = cmd.Start()
 	os.Exit(0) // use os.Exit directly since this version of this function is only meant for non-interactive CLI implementations
 }
diff --git a/core/launchClipClearProcessCLIUNIX.go b/core/launchClipClearProcessCLIUNIX.go
index d780186..ebd3d1d 100644
--- a/core/launchClipClearProcessCLIUNIX.go
+++ b/core/launchClipClearProcessCLIUNIX.go
@@ -14,7 +14,7 @@ import (
 // For non-interactive CLI implementations, an entirely separate process is created for this purpose.
 func LaunchClipClearProcess(copySubject string, isWayland bool) {
 	cmd := exec.Command(os.Args[0], "clipclear", strconv.FormatBool(isWayland))
-	back.WriteToStdin(cmd, copySubject)
+	_ = back.WriteToStdin(cmd, copySubject)
 	_ = cmd.Start()
 	os.Exit(0) // use os.Exit directly since this version of this function is only meant for non-interactive CLI implementations
 }
diff --git a/core/utilitiesMisc.go b/core/utilitiesMisc.go
index 9bee40f..0412222 100644
--- a/core/utilitiesMisc.go
+++ b/core/utilitiesMisc.go
@@ -156,13 +156,13 @@ func ClampTrailingWhitespace(note []string) {
 // Returns: statusCode (0 = success, 1 = target location already exists, 2 = containing directory is invalid).
 func EntryAddPrecheck(targetLocation string) (uint8, error) {
 	// ensure target location does not already exist
-	_, isAccessible := back.TargetIsFile(targetLocation, false, 0)
+	_, isAccessible, _ := back.TargetIsFile(targetLocation, false, 0) // error is ignored because errorOnFail is false
 	if isAccessible {
 		return 1, errors.New("target location already exists")
 	}
 	// ensure target containing directory exists and is a directory (not a file)
 	containingDir := targetLocation[:strings.LastIndex(targetLocation, global.PathSeparator)]
-	isFile, isAccessible := back.TargetIsFile(containingDir, false, 1)
+	isFile, isAccessible, _ := back.TargetIsFile(containingDir, false, 1) // error is ignored because errorOnFail is false
 	if isFile || !isAccessible {
 		return 2, errors.New("\"" + containingDir + "\" is not a valid containing directory")
 	}
diff --git a/global/1globals.go b/global/1globals.go
index 2df853e..cbc523a 100644
--- a/global/1globals.go
+++ b/global/1globals.go
@@ -13,10 +13,8 @@ const (
 	FSPath  = "\u259e" // ▞ Path separator
 	FSMisc  = "\u259f" // ▟ Misc. field separator (if \u259d is already used)
 
-	ErrorSyncProcess      = 103
-	ErrorServerConnection = 104
-	ErrorTargetExists     = 106
-	ErrorDecryption       = 108
-	ErrorEncryption       = 109
-	ErrorClipboard        = 110
+	ErrorSyncProcess = 104
+	ErrorDecryption  = 105
+	ErrorEncryption  = 106
+	ErrorClipboard   = 107
 )
diff --git a/global/init.go b/global/init.go
index 54db209..91de0ca 100644
--- a/global/init.go
+++ b/global/init.go
@@ -24,7 +24,7 @@ func DirInit(preserveOldConfigDir bool) (string, error) {
 
 	// remove existing config directory (if it exists and not in append mode)
 	if !preserveOldConfigDir {
-		_, isAccessible := back.TargetIsFile(ConfigDir, false, 1)
+		_, isAccessible, _ := back.TargetIsFile(ConfigDir, false, 1) // error is ignored because errorOnFail is false
 		if isAccessible {
 			err = os.RemoveAll(ConfigDir)
 			if err != nil {
diff --git a/go.mod b/go.mod
index e8ab0e7..430ebde 100644
--- a/go.mod
+++ b/go.mod
@@ -5,7 +5,7 @@ go 1.24.3
 require (
 	github.com/pkg/sftp v1.13.9
 	github.com/pquerna/otp v1.5.0
-	github.com/rwinkhart/go-boilerplate v0.0.0-20250529185306-e2e64d7fa43b
+	github.com/rwinkhart/go-boilerplate v0.0.0-20250601181619-e38a47784de0
 	github.com/rwinkhart/rcw v0.2.0
 	golang.design/x/clipboard v0.7.0 // only for Android builds
 	golang.org/x/crypto v0.38.0
diff --git a/go.sum b/go.sum
index 17c2e15..6dd9c8a 100644
--- a/go.sum
+++ b/go.sum
@@ -13,8 +13,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/pquerna/otp v1.5.0 h1:NMMR+WrmaqXU4EzdGJEE1aUUI0AMRzsp96fFFWNPwxs=
 github.com/pquerna/otp v1.5.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
-github.com/rwinkhart/go-boilerplate v0.0.0-20250529185306-e2e64d7fa43b h1:ENgsUlCmYktd1eauEkjW6Fu8rgZzyGOS/m/6jc968xI=
-github.com/rwinkhart/go-boilerplate v0.0.0-20250529185306-e2e64d7fa43b/go.mod h1:cnzIF45I0FCOvE4YIB+26pLCUx2kWyY2llKYZruNaRY=
+github.com/rwinkhart/go-boilerplate v0.0.0-20250601181619-e38a47784de0 h1:Zuwn0er30tMYrBXD1n4nM3mkGhrLFAdn3sZyMHkxx2I=
+github.com/rwinkhart/go-boilerplate v0.0.0-20250601181619-e38a47784de0/go.mod h1:cnzIF45I0FCOvE4YIB+26pLCUx2kWyY2llKYZruNaRY=
 github.com/rwinkhart/go-winio-easy-pipe-handles v0.0.0-20250407031321-96994a0e8410 h1:NhHwFM3Pgm6zRUfFKvi0p5ndjfFbVWsRwmmhyFlG4PE=
 github.com/rwinkhart/go-winio-easy-pipe-handles v0.0.0-20250407031321-96994a0e8410/go.mod h1:yd8OoFMLzJbo9gZq8j5qaps8bJ9aShtEA8Ipt1oGCvU=
 github.com/rwinkhart/peercred-mini v0.1.0 h1:TiS6u8cEWzW55S9X4iVpU72Iuy/NG6rMUJMtUEVEFLw=
diff --git a/libmuttonserver.go b/libmuttonserver.go
index 8034183..7ed8080 100644
--- a/libmuttonserver.go
+++ b/libmuttonserver.go
@@ -8,6 +8,7 @@ import (
 	"strings"
 
 	"github.com/rwinkhart/go-boilerplate/back"
+	"github.com/rwinkhart/go-boilerplate/other"
 	"github.com/rwinkhart/libmutton/global"
 	"github.com/rwinkhart/libmutton/synccommon"
 	"github.com/rwinkhart/libmutton/syncserver"
@@ -70,7 +71,7 @@ func main() {
 		// create the necessary directories for libmuttonserver to function
 		_, err := global.DirInit(false)
 		if err != nil {
-			back.PrintError("Failed to initialize libmuttonserver directories: "+err.Error(), back.ErrorWrite, true)
+			other.PrintError("Failed to initialize libmuttonserver directories: "+err.Error(), back.ErrorWrite, true)
 		}
 		_ = os.MkdirAll(global.ConfigDir+global.PathSeparator+"deletions", 0700) // error ignored; failure would have occurred by this point in core.DirInit
 		fmt.Println("libmuttonserver directories initialized")
diff --git a/syncclient/client.go b/syncclient/client.go
index 7a0d398..4aabfc1 100644
--- a/syncclient/client.go
+++ b/syncclient/client.go
@@ -417,7 +417,7 @@ func folderSync(folders []string) error {
 		folderFullPath := global.TargetLocationFormat(folder)
 
 		// check if folder already exists
-		isFile, isAccessible := back.TargetIsFile(folderFullPath, false, 1)
+		isFile, isAccessible, _ := back.TargetIsFile(folderFullPath, false, 1) // error is ignored because errorOnFail is false
 
 		if !isFile && !isAccessible {
 			err := os.MkdirAll(folderFullPath, 0700)
diff --git a/synccommon/common.go b/synccommon/common.go
index 9dc8875..dfb1bc1 100644
--- a/synccommon/common.go
+++ b/synccommon/common.go
@@ -66,7 +66,10 @@ func ShearLocal(targetLocationIncomplete, clientDeviceID string) (string, bool,
 	targetLocationComplete := global.TargetLocationFormat(targetLocationIncomplete)
 	var isFile bool
 	if !onServer { // error if target does not exist on client, needed because os.RemoveAll does not return an error if target does not exist
-		isFile, _ = back.TargetIsFile(targetLocationComplete, true, 0)
+		isFile, _, err = back.TargetIsFile(targetLocationComplete, true, 0)
+		if err != nil {
+			return "", false, err
+		}
 	}
 	err = os.RemoveAll(targetLocationComplete)
 	if err != nil {
@@ -93,7 +96,7 @@ func RenameLocal(oldLocationIncomplete, newLocationIncomplete string, verifyOldL
 	}
 
 	// ensure newLocation does not exist
-	_, isAccessible := back.TargetIsFile(newLocation, false, 0)
+	_, isAccessible, _ := back.TargetIsFile(newLocation, false, 0) // error is ignored because errorOnFail is false
 	if isAccessible {
 		return errors.New("target already exists: " + newLocation)
 	}