Connection Failed: Unable to load DLL ‘DXFeed_64.dll’
Connection Failed: Unable to load DLL ‘DXFeed_64.dll’
(Exception from HRESULT: 0x8007007E)
Overview
This error occurs when DeepChart is unable to load the DXFeed DLL file, which is required for the data feed to function properly.
The most common cause is that Microsoft Visual C++ Redistributable is missing or outdated on your Windows system. DXFeed requires the latest supported Visual C++ runtime to operate correctly.
Cause
Required Visual C++ Redistributable packages are not installed
Installed Visual C++ version is outdated or corrupted
DXFeed cannot load
DXFeed_64.dllwithout the correct runtime libraries
This is a system dependency issue, not a DeepChart software bug.
Solution: Install Latest Microsoft Visual C++ Redistributable
Step 1: Close DeepChart
Make sure DeepChart is completely closed before proceeding.
Step 2: Download Visual C++ Redistributable
Download and install the latest supported Visual C++ Redistributable based on your system architecture.
If you are not sure which processor you have, install both X86 and X64 versions.
| Architecture | Download Link | Notes |
|---|---|---|
| ARM64 | https://aka.ms/vc14/vc_redist.arm64.exe | Latest supported ARM64 version |
| X86 (32-bit) | https://aka.ms/vc14/vc_redist.x86.exe | Required even on some 64-bit systems |
| X64 (64-bit) | https://aka.ms/vc14/vc_redist.x64.exe | Includes both X64 and ARM64 binaries |
Step 3: Install the Packages
Run the downloaded installer(s)
Complete the installation
Restart your computer (recommended)
Step 4: Restart DeepChart
Open DeepChart
Connect to the data feed again
✅ The error should now be resolved, and the connection should succeed.
Important Notes
Installing both X86 and X64 versions is safe and recommended if unsure
Visual C++ Redistributables are required by many trading platforms
This issue does not require reinstalling DeepChart
Prevention Tips
Keep Windows and system libraries up to date
Avoid uninstalling Visual C++ packages manually
After a fresh Windows install, always install required runtimes before using trading software
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