The Eye Tribe

What I used is Matlab .

Once I send command to server, it stop working.

For example, I want to send command like

{
"category":"heartbeat"
}


And Then I check the log file, it is said.

2014-07-17:16:46:26.072|1946653853|I|Creating new connection [188978593792]
2014-07-17:16:46:26.072|1946653853|E|Invalid JSON format: [{]
2014-07-17:16:46:26.072|1946653853|W|Unknown category
2014-07-17:16:46:26.072|1946653853|E|Invalid JSON format: ["]
2014-07-17:16:46:26.072|1946653853|W|Unknown category
2014-07-17:16:46:26.073|1946653853|E|Invalid JSON format: [ca]
2014-07-17:16:46:26.073|1946653853|W|Unknown category
2014-07-17:16:46:26.073|1946653853|E|Invalid JSON format: [teg]
2014-07-17:16:46:26.073|1946653853|W|Unknown category
2014-07-17:16:46:26.074|1946653853|E|Invalid JSON format: [ory":"heartbeat"}]
2014-07-17:16:46:26.074|1946653853|W|Unknown category
2014-07-17:16:46:32.132|1946653853|I|Connection removed [188978593792]

How to correct this error?

many Thanks