diff --git a/arduino-debugger-extension/src/browser/arduino-variable-resolver.ts b/arduino-debugger-extension/src/browser/arduino-variable-resolver.ts
index b094f1e1..be5c0434 100644
--- a/arduino-debugger-extension/src/browser/arduino-variable-resolver.ts
+++ b/arduino-debugger-extension/src/browser/arduino-variable-resolver.ts
@@ -75,7 +75,7 @@ export class ArduinoVariableResolver implements VariableContribution {
             return undefined;
         }
         if (!fileStat.isDirectory && fileStat.uri.endsWith('.elf')) {
-            return fileStat.uri;
+            return new URI(fileStat.uri).path.toString();
         }
 
         let parent: FileStat | undefined;
@@ -106,7 +106,7 @@ export class ArduinoVariableResolver implements VariableContribution {
                 bin = parent.children.find(c => c.uri.endsWith('.elf'));
             }
             if (bin) {
-                return bin.uri;
+                return new URI(bin.uri).path.toString();
             }
         }
         this.messageService.error('Cannot find sketch binary: ' + hint);
diff --git a/arduino-debugger-extension/src/node/debug-adapter/cmsis-debug-session.ts b/arduino-debugger-extension/src/node/debug-adapter/cmsis-debug-session.ts
index a22e8d0d..5dffc940 100644
--- a/arduino-debugger-extension/src/node/debug-adapter/cmsis-debug-session.ts
+++ b/arduino-debugger-extension/src/node/debug-adapter/cmsis-debug-session.ts
@@ -234,7 +234,7 @@ export class CmsisDebugSession extends GDBDebugSession {
             this.symbolTable = new SymbolTable(args.program, args.objdump);
             await this.symbolTable.loadSymbols();
         } catch (error) {
-            this.sendEvent(new OutputEvent(`Unable to load debug symbols: ${error.message}`));
+            throw new Error(`Unable to load debug symbols: ${error.message}`);
         }
 
         const port = await this.portScanner.findFreePort();