added more user actionable errors to error.rst (#744)

* fixed typo for 9XXX

* fixed indentation

* Fixed formatting issues

* fixed linter issue

docs/errors/errors.rst

@@ -41,6 +41,7 @@ Error codes       Messages
 
 **6003**          :Error message: Too few experiments given ({} < {}).
                   :Solution: Increase number of experiments.
+
 ================  ============================================================
 
 
@@ -53,8 +54,8 @@ Error codes       Messages
 ================  ============================================================
 **7000**          :Error message: Instruction not in basis gates:
                                   instruction: {}, qubits: {}, params: {}
-                  :Solution: Circuits must be constructed from backend
-                             basis gates.
+                  :Solution: Instruction not supported by backend. Please
+                             remove the instruction shown in the error message.
 
 **7001**          :Error message: Instruction {} is not supported.
                   :Solution: Remove unsupported instruction, or run on a
@@ -66,10 +67,20 @@ Error codes       Messages
 
 **7003**          :Error message: qubits: {} and classical bits: {} do not
                                   have equal lengths.
-                  :Solution: Qubit and Clbits must be correctly mapped.
+                  :Solution: Length of memory slots must be same as number of
+                              qubits used
 
 **7004**          :Error message: Qubit measured multiple times in circuit.
                   :Solution: Remove multiple measurements on qubits.
+
+**7005**          :Error message: Error in supplied instruction.
+                  :Solution: Please refer to IQX gate overview and make sure
+                             the instructions are correct.
+
+**7006**          :Error message: Qubit measurement is followed by instructions.
+                  :Solution: Cannot perform any instruction on a measured qubit.
+                             Please remove all instructions following a measurement.
+
 ================  ============================================================
 
 
@@ -94,12 +105,53 @@ Error codes       Messages
 **8003**          :Error message: Total pulses exceeds the maximum number of
                                   pulses for channel: {}, ({} > {}).
                   :Solution: Reduce number of pulses below specified limit.
+
+**8004**	  :Error message: Channel {}{} is not available.
+                  :Solution: Must use available drive channels.
+
+**8006**	  :Error message: Gate {}in line {}s not understood ({}).
+                  :Solution: This instruction is not supported. Please make
+                              sure that the gate name is correct and it is within
+                              the gate overview section of IQX website.
+
+**8007**	  :Error message: Qasm gate not understood: {}.
+                  :Solution: The instruction is not understood. Please refer to IQX
+                             website and make sure the instruction is within the gate
+                             overview section.
+
+**8008**	  :Error message: Unconnected Qubits.
+                  :Solution: Please refer to the qubit mapping for this backend in
+                             IQX website and make sure the qubits are connected.
+
+**8009**          :Error message: Measurement level is not supported..
+                  :Solution: The given measurement level is not supported on this backend.
+                             Please change it to 0-2 except the measurement level specified.
+
+**8011**	  :Error message: Pulse experiments are not supported on this system..
+                  :Solution: Pulse experiment is not supported on this backend.
+                             Please use a backend that support pulse to run this experiment.
+
+**8013**	  :Error message: This backend does not support conditional pulses.
+                  :Solution: Conditionals are not supported on this backend.
+                             Please remove the conditional instruction in your program.
+
+**8014**	  :Error message: reset instructions are not supported.
+                  :Solution: Reset instructions are not supported at this time for this
+                             backend. Please remove the reset instruction.
+
+**8016**          :Error message: Pulse {} has too few samples ({} > {}).
+                  :Solution: Please add more samples.
+
+**8017**          :Error message: Pulse not a multiple of {} samples.
+                  :Solution: Due to hardware limitations pulses must be a multiple of a
+                             given number of samples.
+
 ================  ============================================================
 
 
 9XXX
 ====
-.. _9xxx:
+.. _9XXX:
 
 ================  ============================================================
 Error codes       Messages