## Error and Solution

### can not login

Error message:

    Your username and password didn't match.
    Please try again.

Possible reason:

- wrong username or password

Solution:

Check your username and password. Or Ask the administrator to reset your password.

### refuse to acquire

Error message:

    Sorry, but...
    You might see this page if you:
    ......
    WARNING: This will release the FPGA you are currently using.

Possible reason:

- Attemptted to acquire multiple FPGA instances.
- Opened two FPGA pages.
- Refreshed the FPGA page.

Solution:

Open only one FPGA page. Or press Reacquire button.

### no instance available

Error message:

    There are no FPGA instances currently available.

Possible reason:

- Some devices were accidentally offline.
- Many users are using at the same time.
- Both above.

Solution:

Wait and try again. Or contact with the administrator.

### upload or program fail

Error message:

    Failed to program device with the uploaded file. Perhaps this file is not a valid bitstream?

Possible reason:

- You have select the wrong chip(not xc7a100tcsg324-1).
- poor network condition.
- Some device(s) accidentally went wrong.

Solution:

Check the chip you select and try again.

### connection closed

Error message:

    Connection closed unexpectedly!
    Perhaps it's a network error
    or you may be holding FPGA for too long (>10 min).

Possible reason:

- poor network condition.
- timeout.

Solution:

Wait and try again.

### fail to render waveform

No Error message: (your browser get stuck)

Possible reason:

- The signal you put on LED(s) change too rapidly.
- poor network condition.

Solution:

Use period mode waveform.

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