i am getting this error code -200088 some times during read data on digital or analog acuisition from compact daq.
The error information for that code number is:
"Task specified is invalid or does not exist."
So you need to figure out why your task does not exist.
Without any further information in your e-mail, there isn't much we can do to help.
Does the task exist within Measurement and Automation Explorer? Does the task run from within MAX?