How to solve the Assembly and Model Level data errors

VK 2020-02-10

Why this error occurs, How to solve this ?

Find the program given below.......................................

The model "program" has been created.TypeError: mass; found string, expecting float This occurred while processing assembly-level and model-level data. The model "program" has been imported from an input file. Please scroll up to check for error and warning messages.

*Heading

*Preprint, echo=NO, model=NO, history=NO, contact=NO

*Assembly, name=Assembly

*Node

1, 0.,0,0.

*Node

2, 0.,5,0

*Node

3, 0.,10,0.

*Nset,

nset=Set10

*Nset,

nset=Set11

*Element, type=MASS, elset=Set4_Inertia-1_

1, 1

*Mass, elset=Set4_Inertia-1_

(600.),

*Element, type=MASS, elset=Set5_Inertia-2_

2, 2

*Mass, elset=Set5_Inertia-2_

(77.),

*Element, type=SpringA, elset=Springs/Dashpots-1-spring

3, 1, 2